# Asteria Star

> Everything Above Earth. Asteria Star is a knowledge platform for everything above Earth — astronomy, space exploration, the night sky, celestial phenomena, mythology, observation, astrophotography, telescopes, and astrology as a separate cultural tradition.

Astronomy is presented as scientific, evidence-based, and sourced. Astrology is presented as cultural, symbolic, and interpretive — never as proven science.

Astronomy and the Sky Guide are scientific and source-backed. Astrology is presented as cultural and interpretive tradition, never as proven science.

Content is organized in three levels: sections (hubs) → categories (topics) → entries (individual pages, e.g. a specific star, planet, mission, or zodiac sign). There are currently 87 published entries at /[section]/[category]/[entry]. Entries are listed under their category below.

## Astronomy — The universe, studied with evidence.
https://asteriastar.com/astronomy

- [Stars](https://asteriastar.com/astronomy/stars): Luminous spheres of plasma powered by nuclear fusion.
  - [Sirius](https://asteriastar.com/astronomy/stars/sirius): The brightest star in the night sky, in Canis Major.
  - [Betelgeuse](https://asteriastar.com/astronomy/stars/betelgeuse): The red supergiant on Orion's shoulder.
  - [Rigel](https://asteriastar.com/astronomy/stars/rigel): The blue supergiant at Orion's foot.
  - [Vega](https://asteriastar.com/astronomy/stars/vega): The brilliant blue-white star of Lyra.
  - [Polaris](https://asteriastar.com/astronomy/stars/polaris): The North Star, near the north celestial pole.
  - [Proxima Centauri](https://asteriastar.com/astronomy/stars/proxima-centauri): The closest known star to the Sun.
  - [Alpha Centauri](https://asteriastar.com/astronomy/stars/alpha-centauri): The nearest star system to the Sun.
  - [Antares](https://asteriastar.com/astronomy/stars/antares): The red supergiant heart of Scorpius.
  - [Deneb](https://asteriastar.com/astronomy/stars/deneb): The distant supergiant in the tail of Cygnus.
  - [Altair](https://asteriastar.com/astronomy/stars/altair): The fast-spinning white star of Aquila.
  - [Aldebaran](https://asteriastar.com/astronomy/stars/aldebaran): The orange giant eye of Taurus.
  - [Spica](https://asteriastar.com/astronomy/stars/spica): The blue star of Virgo — actually a close binary.
- [Constellations](https://asteriastar.com/astronomy/constellations): The 88 official sky regions and their patterns of stars.
- [Galaxies](https://asteriastar.com/astronomy/galaxies): Gravitationally bound systems of stars, gas, dust, and dark matter.
- [Nebulae](https://asteriastar.com/astronomy/nebulae): Interstellar clouds of gas and dust — stellar nurseries and remnants.
- [Planets](https://asteriastar.com/astronomy/planets): Worlds orbiting the Sun, from rocky terrestrials to gas and ice giants.
  - [Mercury](https://asteriastar.com/astronomy/planets/mercury): The smallest planet, closest to the Sun.
  - [Venus](https://asteriastar.com/astronomy/planets/venus): Earth's size, but a scorching greenhouse world.
  - [Earth](https://asteriastar.com/astronomy/planets/earth): The third planet — and the only known home of life.
  - [Mars](https://asteriastar.com/astronomy/planets/mars): The Red Planet, a cold desert world.
  - [Jupiter](https://asteriastar.com/astronomy/planets/jupiter): The largest planet — a banded gas giant.
  - [Saturn](https://asteriastar.com/astronomy/planets/saturn): The ringed gas giant.
  - [Uranus](https://asteriastar.com/astronomy/planets/uranus): The sideways-spinning ice giant.
  - [Neptune](https://asteriastar.com/astronomy/planets/neptune): The deep-blue, windy ice giant at the edge.
- [Dwarf Planets](https://asteriastar.com/astronomy/dwarf-planets): Rounded worlds that share their orbital zone with other bodies.
  - [Pluto](https://asteriastar.com/astronomy/dwarf-planets/pluto): The most famous dwarf planet, in the Kuiper Belt.
  - [Ceres](https://asteriastar.com/astronomy/dwarf-planets/ceres): The largest body in the asteroid belt.
  - [Eris](https://asteriastar.com/astronomy/dwarf-planets/eris): The distant dwarf planet that reshaped the definitions.
  - [Haumea](https://asteriastar.com/astronomy/dwarf-planets/haumea): The fast-spinning, egg-shaped dwarf planet.
  - [Makemake](https://asteriastar.com/astronomy/dwarf-planets/makemake): A large, bright dwarf planet of the Kuiper Belt.
- [Moons](https://asteriastar.com/astronomy/moons): Natural satellites orbiting planets and smaller bodies.
- [Exoplanets](https://asteriastar.com/astronomy/exoplanets): Planets orbiting stars beyond the Sun.
- [Asteroids](https://asteriastar.com/astronomy/asteroids): Rocky and metallic remnants from the early Solar System.
- [Comets](https://asteriastar.com/astronomy/comets): Icy bodies that grow tails as they near the Sun.
- [Meteorites](https://asteriastar.com/astronomy/meteorites): Space rocks that survive the fall to a planet's surface.
- [Black Holes](https://asteriastar.com/astronomy/black-holes): Regions where gravity is so strong not even light escapes.
- [Quasars](https://asteriastar.com/astronomy/quasars): Brilliant active galactic nuclei in the distant universe.
- [Pulsars](https://asteriastar.com/astronomy/pulsars): Rapidly spinning neutron stars that beam radiation.
- [Supernovae](https://asteriastar.com/astronomy/supernovae): The explosive deaths of stars.
- [Star Clusters](https://asteriastar.com/astronomy/star-clusters): Groups of stars born from the same cloud.
- [Space Missions](https://asteriastar.com/astronomy/space-missions): Robotic and crewed journeys that explore the Solar System and beyond.
  - [Apollo 11](https://asteriastar.com/astronomy/space-missions/apollo-11): The first crewed landing on the Moon, in 1969.
  - [Voyager 1](https://asteriastar.com/astronomy/space-missions/voyager-1): The most distant human-made object, now in interstellar space.
  - [Voyager 2](https://asteriastar.com/astronomy/space-missions/voyager-2): The only probe to visit all four giant planets.
  - [James Webb Space Telescope](https://asteriastar.com/astronomy/space-missions/james-webb-space-telescope): The launch and operation of the great infrared observatory.
  - [Hubble Space Telescope](https://asteriastar.com/astronomy/space-missions/hubble-space-telescope): The launch and in-orbit servicing of Hubble.
  - [Cassini–Huygens](https://asteriastar.com/astronomy/space-missions/cassini-huygens): The mission that orbited Saturn and landed on Titan.
  - [New Horizons](https://asteriastar.com/astronomy/space-missions/new-horizons): The first spacecraft to fly past Pluto.
  - [Juno](https://asteriastar.com/astronomy/space-missions/juno): NASA's mission probing Jupiter from orbit.
  - [Mars Science Laboratory](https://asteriastar.com/astronomy/space-missions/mars-science-laboratory): The mission that landed the Curiosity rover on Mars.
  - [Parker Solar Probe](https://asteriastar.com/astronomy/space-missions/parker-solar-probe): The mission flying through the Sun's outer atmosphere.
- [Spacecraft](https://asteriastar.com/astronomy/spacecraft): The vehicles and probes built to travel and work in space.
- [Space Telescopes](https://asteriastar.com/astronomy/space-telescopes): Observatories in orbit, above the blur of the atmosphere.
  - [Hubble Space Telescope](https://asteriastar.com/astronomy/space-telescopes/hubble-space-telescope): The iconic orbiting observatory of optical astronomy.
  - [James Webb Space Telescope](https://asteriastar.com/astronomy/space-telescopes/james-webb-space-telescope): The great infrared observatory of the modern era.
  - [Spitzer Space Telescope](https://asteriastar.com/astronomy/space-telescopes/spitzer-space-telescope): NASA's pioneering infrared observatory.
  - [Chandra X-ray Observatory](https://asteriastar.com/astronomy/space-telescopes/chandra-x-ray-observatory): NASA's window onto the high-energy X-ray universe.
  - [Kepler Space Telescope](https://asteriastar.com/astronomy/space-telescopes/kepler-space-telescope): The telescope that revealed thousands of exoplanets.
  - [TESS](https://asteriastar.com/astronomy/space-telescopes/tess): NASA's all-sky survey for nearby exoplanets.
- [Observatories](https://asteriastar.com/astronomy/observatories): Ground-based sites built to study the sky.
- [Astronomers](https://asteriastar.com/astronomy/astronomers): The scientists who study the universe — a working directory.

## Sky Guide — What to see in the sky, and when.
https://asteriastar.com/sky-guide

- [Night Sky Tonight](https://asteriastar.com/sky-guide/night-sky-tonight): A guide to what's visible after dark right now.
- [Moon Phase](https://asteriastar.com/sky-guide/moon-phase): The Moon's cycle from new to full and back.
- [Meteor Showers](https://asteriastar.com/sky-guide/meteor-showers): When Earth passes through cometary debris streams.
- [Solar Eclipses](https://asteriastar.com/sky-guide/solar-eclipses): When the Moon passes between Earth and the Sun.
- [Lunar Eclipses](https://asteriastar.com/sky-guide/lunar-eclipses): When the Moon passes through Earth's shadow.
- [Planet Visibility](https://asteriastar.com/sky-guide/planet-visibility): Which planets are visible, and where to look.
- [ISS Tracker](https://asteriastar.com/sky-guide/iss-tracker): Spotting the International Space Station overhead.
- [Comet Visibility](https://asteriastar.com/sky-guide/comet-visibility): Tracking comets bright enough to observe.
- [Sky Calendar](https://asteriastar.com/sky-guide/sky-calendar): A running calendar of notable sky events.
- [Celestial Events](https://asteriastar.com/sky-guide/celestial-events): Explainers for the events that make people look up.
- [Space Weather](https://asteriastar.com/sky-guide/space-weather): Solar storms, the solar wind, and their effects near Earth.
- [Sun Activity](https://asteriastar.com/sky-guide/sun-activity): The Sun's changing activity — sunspots, flares, and the solar cycle.

## Astrology — A cultural and symbolic tradition — clearly labeled as such.
https://asteriastar.com/astrology

- [Zodiac Signs](https://asteriastar.com/astrology/zodiac-signs): The twelve signs and the qualities tradition assigns them.
  - [Aries](https://asteriastar.com/astrology/zodiac-signs/aries): The first zodiac sign — the Ram.
  - [Taurus](https://asteriastar.com/astrology/zodiac-signs/taurus): The second zodiac sign — the Bull.
  - [Gemini](https://asteriastar.com/astrology/zodiac-signs/gemini): The third zodiac sign — the Twins.
  - [Cancer](https://asteriastar.com/astrology/zodiac-signs/cancer): The fourth zodiac sign — the Crab.
  - [Leo](https://asteriastar.com/astrology/zodiac-signs/leo): The fifth zodiac sign — the Lion.
  - [Virgo](https://asteriastar.com/astrology/zodiac-signs/virgo): The sixth zodiac sign — the Maiden.
  - [Libra](https://asteriastar.com/astrology/zodiac-signs/libra): The seventh zodiac sign — the Scales.
  - [Scorpio](https://asteriastar.com/astrology/zodiac-signs/scorpio): The eighth zodiac sign — the Scorpion.
  - [Sagittarius](https://asteriastar.com/astrology/zodiac-signs/sagittarius): The ninth zodiac sign — the Archer.
  - [Capricorn](https://asteriastar.com/astrology/zodiac-signs/capricorn): The tenth zodiac sign — the Sea-Goat.
  - [Aquarius](https://asteriastar.com/astrology/zodiac-signs/aquarius): The eleventh zodiac sign — the Water-Bearer.
  - [Pisces](https://asteriastar.com/astrology/zodiac-signs/pisces): The twelfth zodiac sign — the Fishes.
- [Birth Chart](https://asteriastar.com/astrology/birth-chart): An introduction to the chart of the sky at a moment of birth.
- [Natal Chart](https://asteriastar.com/astrology/natal-chart): Interpreting signs, planets, and houses together in depth.
- [Rising Sign](https://asteriastar.com/astrology/rising-sign): The Ascendant — the sign on the eastern horizon at birth.
- [Moon Sign](https://asteriastar.com/astrology/moon-sign): The sign the Moon occupied at birth, in tradition.
- [Planet Meanings](https://asteriastar.com/astrology/planet-meanings): The symbolic roles tradition gives the planets and luminaries.
  - [Sun in Astrology](https://asteriastar.com/astrology/planet-meanings/sun-in-astrology): The luminary of identity and vitality, in tradition.
  - [Moon in Astrology](https://asteriastar.com/astrology/planet-meanings/moon-in-astrology): The luminary of emotion and instinct, in tradition.
  - [Mercury in Astrology](https://asteriastar.com/astrology/planet-meanings/mercury-in-astrology): The personal planet of mind and communication, in tradition.
  - [Venus in Astrology](https://asteriastar.com/astrology/planet-meanings/venus-in-astrology): The personal planet of love and values, in tradition.
  - [Mars in Astrology](https://asteriastar.com/astrology/planet-meanings/mars-in-astrology): The personal planet of drive and action, in tradition.
  - [Jupiter in Astrology](https://asteriastar.com/astrology/planet-meanings/jupiter-in-astrology): The social planet of expansion and growth, in tradition.
  - [Saturn in Astrology](https://asteriastar.com/astrology/planet-meanings/saturn-in-astrology): The social planet of discipline and structure, in tradition.
  - [Uranus in Astrology](https://asteriastar.com/astrology/planet-meanings/uranus-in-astrology): The outer planet of change and innovation, in tradition.
  - [Neptune in Astrology](https://asteriastar.com/astrology/planet-meanings/neptune-in-astrology): The outer planet of dreams and imagination, in tradition.
  - [Pluto in Astrology](https://asteriastar.com/astrology/planet-meanings/pluto-in-astrology): The outer planet of transformation and power, in tradition.
- [Houses](https://asteriastar.com/astrology/houses): The twelve houses and the life areas tradition links to them.
- [Aspects](https://asteriastar.com/astrology/aspects): Angular relationships between chart points and their meanings.
- [Transits](https://asteriastar.com/astrology/transits): How current planetary positions are read against a birth chart.
- [Progressions](https://asteriastar.com/astrology/progressions): A symbolic technique for advancing a chart over time.
- [Solar Return](https://asteriastar.com/astrology/solar-return): A chart cast for the Sun's yearly return to its birth position.
- [Compatibility](https://asteriastar.com/astrology/compatibility): How traditions compare signs and charts between people.
- [Synastry](https://asteriastar.com/astrology/synastry): Comparing two birth charts side by side.
- [Chinese Zodiac](https://asteriastar.com/astrology/chinese-zodiac): The twelve-year animal cycle of East Asian tradition.
- [Western Astrology](https://asteriastar.com/astrology/western-astrology): The tropical-zodiac tradition rooted in the Mediterranean world.
- [Vedic Astrology](https://asteriastar.com/astrology/vedic-astrology): Jyotisha — the astrological tradition of the Indian subcontinent.

## Calculators — Tools for the sky — astronomical and traditional.
https://asteriastar.com/calculators

- [Natal Chart Calculator](https://asteriastar.com/calculators/natal-chart-calculator): Generate a birth chart wheel from a date, time, and place.
- [Zodiac Sign Calculator](https://asteriastar.com/calculators/zodiac-sign-calculator): Find the sun sign traditionally linked to a birth date.
- [Rising Sign Calculator](https://asteriastar.com/calculators/rising-sign-calculator): Estimate the Ascendant from birth time and place.
- [Moon Sign Calculator](https://asteriastar.com/calculators/moon-sign-calculator): Find the sign the Moon occupied at birth, in tradition.
- [Chinese Zodiac Calculator](https://asteriastar.com/calculators/chinese-zodiac-calculator): Find the animal sign for a birth year.
- [Numerology Calculator](https://asteriastar.com/calculators/numerology-calculator): Derive numerology numbers from a name or date.
- [Life Path Calculator](https://asteriastar.com/calculators/life-path-calculator): Compute the numerology life path number from a birth date.
- [Planet Positions Calculator](https://asteriastar.com/calculators/planet-positions-calculator): Show where the planets are for a given date and place.
- [Compatibility Calculator](https://asteriastar.com/calculators/compatibility-calculator): Compare two signs in the astrological tradition.
- [Synastry Calculator](https://asteriastar.com/calculators/synastry-calculator): Compare two birth charts side by side.
- [Solar Return Calculator](https://asteriastar.com/calculators/solar-return-calculator): Cast a chart for your next solar return.
- [Physics & Fun Calculators](https://asteriastar.com/calculators/physics): Science-based calculators: your age and weight on other worlds.
  - [Age on Mars](https://asteriastar.com/calculators/physics/age-on-mars): Your age in Mars years — the concept and the science.
  - [Age on Venus](https://asteriastar.com/calculators/physics/age-on-venus): Your age in Venus years — the concept and the science.
  - [Age on Mercury](https://asteriastar.com/calculators/physics/age-on-mercury): Your age in Mercury years — the concept and the science.
  - [Age on Jupiter](https://asteriastar.com/calculators/physics/age-on-jupiter): Your age in Jupiter years — the concept and the science.
  - [Weight on the Moon](https://asteriastar.com/calculators/physics/weight-on-moon): Your weight on the Moon — the concept and the science.
  - [Weight on Mars](https://asteriastar.com/calculators/physics/weight-on-mars): Your weight on Mars — the concept and the science.

## Encyclopedia — Definitions, history, and the human context of the sky.
https://asteriastar.com/encyclopedia

- [Glossary](https://asteriastar.com/encyclopedia/glossary): Plain-language definitions of astronomy and astrology terms.
  - [Star](https://asteriastar.com/encyclopedia/glossary/star): A self-gravitating sphere of plasma powered by fusion.
  - [Planet](https://asteriastar.com/encyclopedia/glossary/planet): A round body that orbits the Sun and has cleared its orbit.
  - [Galaxy](https://asteriastar.com/encyclopedia/glossary/galaxy): A gravitationally bound system of stars, gas, dust, and dark matter.
  - [Nebula](https://asteriastar.com/encyclopedia/glossary/nebula): An interstellar cloud of gas and dust.
  - [Supernova](https://asteriastar.com/encyclopedia/glossary/supernova): The explosive death of certain stars.
  - [Black Hole](https://asteriastar.com/encyclopedia/glossary/black-hole): A region of spacetime from which not even light escapes.
  - [Light-Year](https://asteriastar.com/encyclopedia/glossary/light-year): The distance light travels in one year — a measure of distance.
  - [Astronomical Unit](https://asteriastar.com/encyclopedia/glossary/astronomical-unit): The average Earth–Sun distance, about 149.6 million km.
  - [Ecliptic](https://asteriastar.com/encyclopedia/glossary/ecliptic): The Sun's apparent yearly path across the sky.
  - [Zodiac](https://asteriastar.com/encyclopedia/glossary/zodiac): The band of constellations along the ecliptic.
  - [Transit](https://asteriastar.com/encyclopedia/glossary/transit): A smaller body passing across the face of a larger one.
  - [Ascendant](https://asteriastar.com/encyclopedia/glossary/ascendant): In astrology, the zodiac sign rising on the eastern horizon at birth.
- [History of Astronomy](https://asteriastar.com/encyclopedia/history-of-astronomy): How humans learned to read and measure the sky.
- [History of Astrology](https://asteriastar.com/encyclopedia/history-of-astrology): The cultural history of a centuries-old tradition.
- [Ancient Civilizations](https://asteriastar.com/encyclopedia/ancient-civilizations): How early cultures observed and used the sky.
- [Greek Mythology](https://asteriastar.com/encyclopedia/greek-mythology): The Greek myths behind constellation and planet names.
  - [Asteria](https://asteriastar.com/encyclopedia/greek-mythology/asteria): The Titaness of the starry night and shooting stars.
  - [Orion](https://asteriastar.com/encyclopedia/greek-mythology/orion): The giant huntsman of myth and the winter sky.
  - [Andromeda](https://asteriastar.com/encyclopedia/greek-mythology/andromeda): The chained princess rescued by Perseus.
  - [Cassiopeia](https://asteriastar.com/encyclopedia/greek-mythology/cassiopeia): The boastful queen seated on her chair among the stars.
  - [Perseus](https://asteriastar.com/encyclopedia/greek-mythology/perseus): The hero who slew Medusa and saved Andromeda.
  - [The Pleiades](https://asteriastar.com/encyclopedia/greek-mythology/pleiades): The Seven Sisters of myth and the star cluster in Taurus.
- [Roman Mythology](https://asteriastar.com/encyclopedia/roman-mythology): The Roman names that the planets still carry.
- [Egyptian Mythology](https://asteriastar.com/encyclopedia/egyptian-mythology): Sky deities and star lore of ancient Egypt.
- [Babylonian Astronomy](https://asteriastar.com/encyclopedia/babylonian-astronomy): Early systematic record-keeping of the heavens.
- [Famous Astronomers](https://asteriastar.com/encyclopedia/famous-astronomers): The people who changed how we see the cosmos.
- [Space Exploration](https://asteriastar.com/encyclopedia/space-exploration): The story of how humanity reached into space.
- [Physics Basics](https://asteriastar.com/encyclopedia/physics-basics): The physical ideas that make sense of the universe.
- [Timeline](https://asteriastar.com/encyclopedia/timeline): A chronological thread through astronomy's milestones.

## Observatory — See the universe — through verified, openly licensed imagery.
https://asteriastar.com/observatory

- [Image Library](https://asteriastar.com/observatory/image-library): A searchable home for verified, openly licensed space imagery.
- [NASA Gallery](https://asteriastar.com/observatory/nasa-gallery): Highlights from NASA's public imagery.
- [ESA Gallery](https://asteriastar.com/observatory/esa-gallery): Highlights from European Space Agency imagery.
- [James Webb](https://asteriastar.com/observatory/james-webb): Imagery from the James Webb Space Telescope.
- [Hubble](https://asteriastar.com/observatory/hubble): Highlights from the Hubble Space Telescope.
- [Videos](https://asteriastar.com/observatory/videos): Curated, openly licensed astronomy video.
- [Interactive Sky Maps](https://asteriastar.com/observatory/interactive-sky-maps): Pan-and-zoom maps of the night sky.
- [3D Solar System](https://asteriastar.com/observatory/3d-solar-system): An interactive model of the Sun and its worlds.
- [Star Maps](https://asteriastar.com/observatory/star-maps): Reference and printable star charts.
- [NASA Image Archive](https://asteriastar.com/observatory/nasa-image-archive): A future window onto NASA's openly licensed imagery.
- [ESA Image Archive](https://asteriastar.com/observatory/esa-image-archive): A future window onto ESA's openly licensed imagery.
- [Launches](https://asteriastar.com/observatory/launches): A future calendar of rocket launches and their vehicles.

## Guides — Learn the sky, step by step.
https://asteriastar.com/guides

- [Beginner Astronomy](https://asteriastar.com/guides/beginner-astronomy): Start here: the essentials of looking up.
- [How Stars Form](https://asteriastar.com/guides/how-stars-form): From cold gas clouds to shining stars.
- [How Black Holes Work](https://asteriastar.com/guides/how-black-holes-work): Gravity, event horizons, and what falls in.
- [How Telescopes Work](https://asteriastar.com/guides/how-telescopes-work): Collecting and focusing light to see farther.
- [How to Observe the Night Sky](https://asteriastar.com/guides/how-to-observe-the-night-sky): Practical skills for better stargazing.
- [How to Read a Birth Chart](https://asteriastar.com/guides/how-to-read-a-birth-chart): A beginner's path through astrology's chart wheel.
- [Astronomy for Kids](https://asteriastar.com/guides/astronomy-for-kids): Wonder-filled, accurate astronomy for young learners.
- [Advanced Astronomy](https://asteriastar.com/guides/advanced-astronomy): Deeper concepts for experienced observers and learners.

## Explore (knowledge graph)
A knowledge graph of 7351 entities and 12867 relations powers static discovery pages. Scientific, cultural, and astrological connections are kept separate.
- [Explore](https://asteriastar.com/explore)
- [Entity index](https://asteriastar.com/entity-index)
- [Topic index](https://asteriastar.com/topic-index)
- [Discover](https://asteriastar.com/discover)
- [Stars](https://asteriastar.com/explore/stars): Suns near and far — from the brightest in our sky to the Sun's nearest neighbors.
- [Planets](https://asteriastar.com/explore/planets): The eight planets of the Solar System.
- [Dwarf Planets](https://asteriastar.com/explore/dwarf-planets): Rounded worlds that share their orbit, from Pluto to Makemake.
- [Moons](https://asteriastar.com/explore/moons): Natural satellites orbiting the planets.
- [Galaxies](https://asteriastar.com/explore/galaxies): Island universes of stars, gas, and dark matter.
- [Nebulae](https://asteriastar.com/explore/nebulae): Interstellar clouds where stars are born and where they end.
- [Constellations](https://asteriastar.com/explore/constellations): The patterns and official regions of the sky.
- [Star Clusters](https://asteriastar.com/explore/star-clusters): Groups of stars born from the same cloud.
- [Black Holes](https://asteriastar.com/explore/black-holes): Regions where gravity overwhelms even light.
- [Comets](https://asteriastar.com/explore/comets): Icy visitors that grow tails near the Sun.
- [Meteor Showers](https://asteriastar.com/explore/meteor-showers): When Earth sweeps through cometary debris.
- [Space Missions](https://asteriastar.com/explore/missions): Humanity's journeys of exploration beyond Earth.
- [Space Telescopes](https://asteriastar.com/explore/telescopes): Observatories in orbit, above the atmosphere.
- [Observatories](https://asteriastar.com/explore/observatories): Ground-based facilities that study the sky.
- [Astronomers](https://asteriastar.com/explore/astronomers): The people who changed how we see the cosmos.
- [Space Agencies](https://asteriastar.com/explore/space-agencies): The agencies and institutions of spaceflight and astronomy.
- [Launch Vehicles](https://asteriastar.com/explore/launch-vehicles): The rockets that carry missions beyond Earth.
- [Satellites & Stations](https://asteriastar.com/explore/satellites): Spacecraft and stations in orbit around Earth.
- [Exoplanets](https://asteriastar.com/explore/exoplanets): Worlds orbiting other stars, and the systems that host them.
- [Deep Sky](https://asteriastar.com/explore/deep-sky): Galaxies, nebulae, clusters, and black holes beyond the Solar System.
- [Catalogs](https://asteriastar.com/explore/catalogs): The great catalogues of the sky — Messier, NGC, and more.
- [Sky Mythology](https://asteriastar.com/explore/mythology): The myths and figures behind the names in the sky.
- [Night Sky](https://asteriastar.com/explore/night-sky): Events and objects to watch for overhead — showers, comets, and bright constellations.
- [Stars in Orion](https://asteriastar.com/connections/stars-in-orion): The bright stars that make up the constellation Orion, the Hunter.
- [Moons of Jupiter](https://asteriastar.com/connections/moons-of-jupiter): Jupiter's major moons, including the four Galilean moons discovered by Galileo.
- [Moons of Saturn](https://asteriastar.com/connections/moons-of-saturn): Major moons of Saturn, including Titan and Enceladus.
- [NASA Missions](https://asteriastar.com/connections/nasa-missions): Spacecraft and observatories operated by NASA in the knowledge graph.
- [Missions to Mars](https://asteriastar.com/connections/missions-to-mars): Spacecraft whose mission target is the planet Mars.
- [Space Telescopes](https://asteriastar.com/connections/space-telescopes): Orbiting observatories that study the universe from above the atmosphere.
- [Observed by James Webb](https://asteriastar.com/connections/galaxies-observed-by-james-webb): Deep-sky objects the James Webb Space Telescope has studied.
- [The Solar System](https://asteriastar.com/connections/the-solar-system): The Sun, planets, and dwarf planets bound by the Sun's gravity.
- [Greek Mythology of the Sky](https://asteriastar.com/connections/greek-mythology-of-the-sky): Mythological figures linked to the constellations and the night sky.
- [Deep-Sky Objects](https://asteriastar.com/connections/deep-sky-objects): Galaxies, nebulae, star clusters, and black holes beyond the Solar System.
- [Messier Objects](https://asteriastar.com/connections/messier-objects): The deep-sky objects of Charles Messier's catalogue.
- [NGC Objects](https://asteriastar.com/connections/ngc-objects): Selected objects from the New General Catalogue.
- [Moons of Uranus](https://asteriastar.com/connections/moons-of-uranus): The major moons of Uranus, named for literary characters.
- [Launch Vehicles](https://asteriastar.com/connections/launch-vehicles): Rockets that carry missions to orbit and beyond.

## Learn (learning paths)
- [Observing the Night Sky](https://asteriastar.com/learn/observing-the-night-sky): A practical path to observing — the Moon, planets, meteor showers, eclipses, satellites, and space weather. Each lesson connects to real sky objects and honest, source-backed data (no fabricated live values).
- [Understanding the Universe](https://asteriastar.com/learn/understanding-the-universe): The scientific story of the cosmos — how it began, how it evolved, and how we know. Each lesson connects to real cosmology entities, with the scientific consensus made explicit.
- [History of Astronomy](https://asteriastar.com/learn/history-of-astronomy): How humanity came to understand the universe — from the first sky-watchers to the age of gravitational waves. Each lesson connects to real astronomers, discoveries, and eras in the knowledge graph.
- [Exoplanets](https://asteriastar.com/learn/exoplanets): Worlds beyond the Sun — how we find them, what kinds there are, and how scientists weigh whether any could be habitable. Built on real planets and systems from the NASA Exoplanet Archive.
- [Observatories & Telescopes](https://asteriastar.com/learn/observatories-and-telescopes): How astronomers observe the universe — across every band of light and beyond, from mountaintop optical giants to space telescopes, radio arrays, and gravitational-wave detectors. Built on real observatories, telescopes, and surveys.
- [Human Spaceflight](https://asteriastar.com/learn/human-spaceflight): How humans travel, live, and work in space — from the first orbits to space stations, spacewalks, and the road back to the Moon. Built on real missions, stations, spacecraft, and astronauts.
- [History of Space Exploration](https://asteriastar.com/learn/history-of-space-exploration): From Sputnik to Mars rovers and the James Webb Space Telescope — how humanity learned to reach into space, told through real missions, spacecraft, agencies, and the people who flew. Built on authoritative public sources.
- [Deep Sky & Galaxies](https://asteriastar.com/learn/deep-sky-and-galaxies): A guided tour beyond the Solar System — galaxies, nebulae, and star clusters from the Messier, Caldwell, and NGC/IC catalogues, with practical guidance on observing each one. Built on real OpenNGC catalogue data.
- [The Solar System](https://asteriastar.com/learn/the-solar-system): A guided tour of the Sun and the worlds that orbit it — planets, moons, small bodies, and the missions that explore them, all built on real NASA data.
- [Understanding Stars](https://asteriastar.com/learn/understanding-stars): From what a star is to how stars live and die — a guided path through the star encyclopedia, built on real catalogue data.
- [Learn Astronomy](https://asteriastar.com/learn/learn-astronomy): A guided journey from looking up to understanding the universe.
- [Learn Stars](https://asteriastar.com/learn/learn-stars): From the Sun to supergiants — how stars live, shine, and die.
- [Learn Space Exploration](https://asteriastar.com/learn/learn-space-exploration): Humanity's journey beyond Earth — missions, vehicles, and agencies.
- [Learn Galaxies](https://asteriastar.com/learn/learn-galaxies): From the Milky Way to the deep field — the great systems of stars.
- [Learn Black Holes](https://asteriastar.com/learn/learn-black-holes): Gravity at its most extreme — event horizons and the unseen.
- [Learn Telescopes](https://asteriastar.com/learn/learn-telescopes): How we see farther — from backyard optics to orbiting observatories.
- [Learn the Night Sky](https://asteriastar.com/learn/learn-night-sky): Find your way around the sky — constellations, planets, and events.
- [Learn Astrophotography](https://asteriastar.com/learn/learn-astrophotography): Capturing the sky — the targets and the craft.
- [Learn Greek Sky Mythology](https://asteriastar.com/learn/learn-greek-sky-mythology): The myths behind the constellations — cultural heritage, not science.
- [Understanding Launch Vehicles](https://asteriastar.com/learn/understanding-launch-vehicles): How rockets reach orbit — twelve steps through fundamentals, stages, engines, propellants, human-rating, reusability, and the future of space transportation. Built on real launch-vehicle data; no fabricated performance figures.
- [Understanding Constellations](https://asteriastar.com/learn/understanding-constellations): Learn to read the night sky — the celestial sphere and coordinates, the zodiac, the seasonal and circumpolar sky, star designations, and how to find and star-hop between the 88 constellations. Built on real IAU constellation data.
- [Understanding Artificial Satellites](https://asteriastar.com/learn/understanding-satellites): How the satellites that watch the Earth, connect the world, and navigate the planet actually work — the orbits they use, what they do, who operates them, and how the space age began. Built on real satellite data that reuses the platform's agencies, rockets, and launch sites; nothing is fabricated.
- [Understanding Asteroids](https://asteriastar.com/learn/understanding-asteroids): The rocky and icy small bodies of the Solar System — where they live, what they are made of, how they group into families and populations, how spacecraft explore them, and how near-Earth objects are tracked. Built on real MPC/JPL data that reuses the platform's dwarf planets, asteroids, and missions; nothing is fabricated.
- [Understanding Comets and Small-Body Reservoirs](https://asteriastar.com/learn/understanding-comets): The icy small bodies of the Solar System — what comets are, where they come from, how they were explored, and how they connect to the meteor showers. Built on real MPC/JPL data that reuses the platform's comets, meteor showers, missions, and the asteroid encyclopedia's trans-Neptunian reservoirs; nothing is fabricated.
- [Understanding Meteors & Meteorites](https://asteriastar.com/learn/understanding-meteorites): The small bodies that reach the ground — how meteors become meteorites, how they are classified, where they come from, and the fireballs and craters they leave behind. Built on real Meteoritical Bulletin data that reuses the platform's asteroids, impact events, and meteor showers; nothing is fabricated.
- [Understanding Interstellar Objects](https://asteriastar.com/learn/understanding-interstellar-objects): Visitors from beyond the Solar System — what makes an object interstellar, how hyperbolic orbits reveal it, how the confirmed objects (1I/ʻOumuamua, 2I/Borisov, 3I/ATLAS) were found, and how astronomers tell them apart from Solar-System comets and from unconfirmed candidates. Built on real MPC/JPL data; confirmed and candidate objects are kept clearly separate and nothing is fabricated.
- [Understanding Small-Body Missions](https://asteriastar.com/learn/understanding-small-body-missions): How we reached the asteroids and comets — the flybys, orbiters, landers, impactors, and sample-return missions that explored them, from Giotto at Halley to OSIRIS-REx at Bennu and DART at Dimorphos. Built on real NASA/JPL, ESA, and JAXA mission data that reuses the platform's spacecraft, rockets, asteroids, and comets; planned missions claim no results they have not achieved and nothing is fabricated.
- [Understanding Deep Space Communications](https://asteriastar.com/learn/understanding-deep-space-communications): How we stay in touch with, and navigate, spacecraft across the Solar System — the giant antennas and tracking stations, the radio and laser signal bands, the light-time that makes deep space so hard, and the radiometric, optical, and autonomous navigation that keeps missions on course. Built on real NASA/JPL, ESA, and JAXA data that reuses the platform's networks and missions; nothing is fabricated.
- [Understanding the Space Environment](https://asteriastar.com/learn/understanding-space-environment): The hazards of space — the Sun's storms, the radiation of the Solar System and galaxy, and the debris and plasma that threaten spacecraft and astronauts — and the missions that watch for them. Built on real NASA and NOAA data; this encyclopedia states no live conditions and nothing is fabricated.
- [Understanding Mission Operations](https://asteriastar.com/learn/understanding-mission-operations): The operational infrastructure behind every mission — the control centres and the functions that fly spacecraft, from mission control and flight dynamics to fault protection and the operations lifecycle. Built on real NASA, ESA, and agency data; nothing is fabricated.
- [Understanding Spacecraft Systems](https://asteriastar.com/learn/understanding-spacecraft-systems): The engineering of spacecraft — the subsystems and components that make a machine work in space for years without repair. Built on real NASA and ESA engineering; nothing is fabricated.
- [Understanding Scientific Instruments](https://asteriastar.com/learn/understanding-scientific-instruments): How spacecraft do science — the classes of instrument and the payloads that map worlds, read composition in light, and sense the invisible environment of space. Built on real NASA and ESA mission data; nothing is fabricated.
- [Understanding Planetary Geology](https://asteriastar.com/learn/understanding-planetary-geology): How to read the surface of a world — the craters, volcanoes, canyons, dunes, and ice plains that record a planet's history. Built on real NASA/JPL planetary data across the Solar System; nothing is fabricated.
- [Understanding Space Institutions](https://asteriastar.com/learn/understanding-space-institutions): Who builds and flies the spacecraft — the space agencies, field centers, laboratories, and companies of the space enterprise, and how they fit together. Built on real organizations from NASA, ESA, and JAXA; nothing is fabricated.
- [Understanding the History of Spaceflight](https://asteriastar.com/learn/understanding-the-history-of-spaceflight): How humanity reached space and explored the Solar System — the eras, the milestone firsts, and the records, from Sputnik to Artemis. Built on real dated events; nothing is fabricated.
- [Understanding Humans in Space](https://asteriastar.com/learn/understanding-humans-in-space): What spaceflight does to the human body, how a crew is kept alive, and how their health is protected on the way to the Moon and Mars. Built on real NASA/ESA human research; quantitative figures are omitted unless well established.
- [Understanding Building in Space](https://asteriastar.com/learn/understanding-building-in-space): How the next era of spaceflight will make and build things in space instead of launching them — mining the Moon and asteroids, printing parts in orbit, and building depots, habitats, and power stations. Each technology's real maturity is stated honestly.
- [Understanding the Future of Exploration](https://asteriastar.com/learn/understanding-the-future-of-exploration): What comes next in space — the missions being built and the concepts being studied, from the Artemis return to the Moon to the search for life around other stars. Only official or credible missions, with honest status and open questions.
- [Understanding How Astronomy Works](https://asteriastar.com/learn/understanding-how-astronomy-works): The methods behind the science — how astronomers measure a distance, read a spectrum, weigh a black hole, and detect a ripple in spacetime, and how uncertainty is measured rather than hidden. Built on real techniques; nothing is fabricated.
- [Understanding the Dynamic Universe](https://asteriastar.com/learn/understanding-the-dynamic-universe): How astronomers watch the universe change — across every wavelength and messenger — and the transients, alert networks, and workflows that turn a flicker in the sky into science within hours. Built on real observations; nothing is fabricated.
- [Understanding Galaxies](https://asteriastar.com/learn/understanding-galaxies): The extragalactic universe — the forms of galaxies, the active nuclei at their hearts, how they evolve, and the great structures they build. Built on real galaxies and object classes; nothing is fabricated.
- [Understanding the Search for Life](https://asteriastar.com/learn/understanding-the-search-for-life): How science asks whether we are alone — how life might begin, where it could survive, and how we would recognise its signs without being fooled. Built on real astrobiology; no claim of alien life is asserted.
- [Understanding Planetary Defense](https://asteriastar.com/learn/understanding-planetary-defense): How humanity would find and, if necessary, deflect a hazardous asteroid — the surveys, the risk scales, and the missions like DART that have shown an asteroid can be moved. Built on real programs; speculative methods are marked as such.
- [Understanding Space Data Archives & Open Science](https://asteriastar.com/learn/understanding-data-archives): Where astronomy's data lives and how it is shared — the archives that hold the observations of the world's telescopes, the formats that let the data be shared, the Virtual Observatory that makes them searchable as one, and the open-science practices that make results findable, citable, and reusable. Curated from NASA, ESA, ESO, and the archive operators; nothing is fabricated.
- [Understanding the Observatory Frontier](https://asteriastar.com/learn/understanding-the-observatory-frontier): How the largest telescopes ever built actually see — the giant facilities of the coming decade, the adaptive optics that erase the atmosphere, the detectors that count single photons, and the interferometers that reach the sharpest vision in astronomy. Built on real facilities and techniques; facilities under construction are stated as such.
- [Understanding the Cosmic Distance Ladder](https://asteriastar.com/learn/understanding-the-distance-ladder): How the universe is measured, rung by rung — from the geometry of parallax to the exploding stars that reach across the cosmos — and how following the ladder to its top revealed the Hubble tension. Built on real methods and measurements; values are not invented and proposed resolutions are labelled unconfirmed.
- [Understanding Space Weather](https://asteriastar.com/learn/understanding-space-weather): How the Sun's weather is made and how it reaches the Earth — the solar cycle and its storms, and their impacts on satellites, navigation, aviation, astronauts, and power grids — and the operational forecasting that watches for it. Built on documented effects and real forecasting services; nothing is fabricated.
- [Understanding Machine Learning in Astronomy](https://asteriastar.com/learn/understanding-machine-learning-in-astronomy): How astronomy keeps up with the flood of survey data — the machine-learning methods that classify and discover at scale, the applications where they meet the sky, the brokers that triage the alert stream in real time, and the data engineering that keeps it honest. Built on real methods, brokers, and benchmark datasets; nothing is fabricated.
- [Understanding Citizen & Amateur Astronomy](https://asteriastar.com/learn/understanding-citizen-astronomy): How anyone can take part in astronomy — from classifying galaxies online to timing an occultation from the backyard — and how amateurs still contribute to the research frontier. Built on real projects, organisations, and equipment; nothing is fabricated.
- [Understanding Multi-Messenger Astronomy](https://asteriastar.com/learn/understanding-multi-messenger-astronomy): How the universe is now observed in gravitational waves, neutrinos, and light at once — the detectors that feel a merger a billion light-years away, the sources that ring spacetime, and the race from alert to counterpart. Built on real detectors and events; proposed detectors are stated as such.
- [Understanding Comparative Planetology](https://asteriastar.com/learn/understanding-comparative-planetology): Why Venus is a furnace, Mars a frozen desert, and Earth alive — the handful of processes, of interiors and atmospheres and magnetic fields, that play out to wildly different ends across the worlds. Built on real planetary science; hypothetical world-types are labelled as proposed.
- [Understanding Astrochemistry](https://asteriastar.com/learn/understanding-astrochemistry): How the rich chemistry of the cold clouds between the stars — water, alcohols, and the rings of carbon that carry the galaxy's soot — is built atom by atom and inherited by every new star, planet, and comet. Built on real molecules and observations; nothing is fabricated.
- [Understanding Space Policy & Sustainability](https://asteriastar.com/learn/understanding-space-policy): The rules that govern a crowded, commercial, contested domain — the treaties that keep space peaceful, the sustainability of orbits filling with satellites and debris, and the economy that launches it all. Built on real treaties and policy; treaty years are historical facts.
- [Understanding the History & Philosophy of Discovery](https://asteriastar.com/learn/understanding-the-history-of-discovery): How astronomy became modern science, and how it knows what it knows — the revolutions that remade our picture of the cosmos, the instruments that opened each new window, and the philosophy that tells us when a claim about the sky is really knowledge. Built on real history and philosophy of science.
- [Understanding Celestial Mechanics & Timekeeping](https://asteriastar.com/learn/understanding-celestial-mechanics): The exacting mathematics beneath every predicted eclipse, spacecraft trajectory, and star chart — the laws of how bodies fall around one another, and the conventions that pin down where a thing is and when. Built on well-established mechanics and standards; only real constants are stated.
- [Understanding Stellar Astrophysics](https://asteriastar.com/learn/understanding-stellar-astrophysics): How a star is born from a collapsing cloud, forges the elements of the periodic table in its core, and ends as a white dwarf, neutron star, or black hole. Built on well-established astrophysics; nothing is fabricated.
- [Understanding the Milky Way](https://asteriastar.com/learn/understanding-the-milky-way): The anatomy of the galaxy we live in — its discs, bulge, bar and spiral arms, the black hole at its heart, how it turns and reveals its dark matter, and how it will one day merge with Andromeda. Built on well-established galactic astronomy; nothing is fabricated.
- [Understanding Astroinformatics](https://asteriastar.com/learn/understanding-astroinformatics): The software, computing, and data infrastructure behind modern astronomy — the open-source tools researchers compute with, the platforms that bring analysis to petabytes of survey data, and the practices that keep it all reproducible. Built on well-established practice; nothing is fabricated.
- [Understanding Deep-Space Human Exploration](https://asteriastar.com/learn/understanding-deep-space-exploration): What it takes to send people beyond Earth to stay — the bases, transit habitats, power and propulsion of the Moon-to-Mars campaign, and the hard human challenges of radiation, isolation, and self-sufficiency far from home. Built on well-established plans and physics; nothing is fabricated.
- [Navigating the Sky Atlas](https://asteriastar.com/learn/navigating-the-sky-atlas): How to read the visual layer of AsteriaStar — the all-sky star charts drawn from real coordinates, the constellation and deep-sky atlases, and the explorers that browse the Solar System, the Milky Way, and the Local Group. Every map is drawn from measured positions; nothing is invented.
- [Using the Scientific Calculators](https://asteriastar.com/learn/using-the-scientific-calculators): How to compute the numbers of astronomy yourself — orbital speeds and periods, stellar luminosities and lifetimes, distances from magnitudes, exoplanet temperatures, and telescope optics. Each calculator evaluates its published formula from real constants; every one is validated against a known result.
- [Planning a Night of Observing](https://asteriastar.com/learn/planning-a-night-of-observing): How to plan a night under the stars with the observatory suite — finding the dark hours, tracking the Moon and planets, choosing targets at their highest, and matching them to your gear. Built on the platform's real computed sky data; observing conditions come only from connected providers.
- [Exploring the Knowledge Graph](https://asteriastar.com/learn/exploring-the-knowledge-graph): How to explore everything AsteriaStar knows as one connected graph — reading its statistics, walking an entity's neighbourhood, and tracing the shortest chain of relations between any two things in the cosmos. Every number is counted live from the real graph.
- [Using the Research Assistant](https://asteriastar.com/learn/using-the-research-assistant): How to get grounded, explainable answers from AsteriaStar's research assistant — comparing concepts by their real connections, tracing evidence chain by chain, and following the provenance of every fact. The assistant answers from the knowledge graph alone and never makes things up.
- [Reading Live Scientific Data](https://asteriastar.com/learn/reading-live-scientific-data): How AsteriaStar connects to real external data providers — space weather, solar activity, near-Earth objects — and how its honesty envelope tells you exactly what is connected, what is not, and why no value is ever fabricated.
- [Seeing the Universe in 3D](https://asteriastar.com/learn/seeing-the-universe-in-3d): How AsteriaStar builds an interactive three-dimensional universe from real measured coordinates — true parallax distances, to-scale orbits, and the celestial sphere — and how it stays honest about what can, and cannot, be placed in true 3D.
- [Building a Research Workspace](https://asteriastar.com/learn/building-a-research-workspace): How to use AsteriaStar's private, local-only workspace — saving entities, organising collections and reading lists, taking notes, collecting real citations, and exporting your work — without an account and without your data ever leaving your browser.
- [Using the Grounded Assistant](https://asteriastar.com/learn/using-the-grounded-assistant): How AsteriaStar's grounded assistant answers from the knowledge graph alone — explaining entities, comparing concepts, tracing evidence paths, and building learning paths — and how it stays honest: it returns only real facts and citations, never generates prose, and says 'not enough graph evidence' rather than guess.
- [Building on the Open Platform](https://asteriastar.com/learn/building-on-the-open-platform): How to build on AsteriaStar as an open, research-grade data platform — the public Graph API, the JSON and JSON-LD/RDF exports, bulk downloads with verifiable checksums, and the licensing — and how it stays honest about the standards it is architecture-ready for but does not yet host.
- [Understanding the Sun](https://asteriastar.com/learn/understanding-the-sun): A tour of the nearest star from the inside out — the fusion core, the radiative and convective interior, the visible surface and the million-degree corona, the magnetic activity and the eleven-year cycle, and the solar wind that blows the heliosphere out to the Voyagers.
- [Black Holes & Neutron Stars](https://asteriastar.com/learn/black-holes-and-neutron-stars): The end-states of gravity — the geometry of a black hole from its horizon to its singularity, the jets it launches, and the neutron star: a Sun crushed into a city, spinning as a pulsar and holding matter denser than an atomic nucleus. From the physics to the real objects in the sky.
- [How the Sky Is Catalogued](https://asteriastar.com/learn/how-the-sky-is-catalogued): Every object in the sky has a name — usually many. A path through the professional catalogue layer: the great reference lists from the Bonner Durchmusterung to Gaia, the families they fall into, and the designation systems, from Bayer letters to variable-star names, that let astronomers point unambiguously at any star, cluster, or galaxy.
- [The Deep-Sky Menagerie](https://asteriastar.com/learn/the-deep-sky-menagerie): Beyond the Solar System lies a menagerie of clusters, nebulae, and galaxies. A path through the classes of deep-sky object — from the young open clusters and glowing HII regions to the cast-off shells of dying stars and the wreckage of supernovae — each tied to real objects you can find in the sky.
- [Where & When in the Sky](https://asteriastar.com/learn/where-and-when-in-the-sky): Pointing at a star precisely takes more than a name. A path through the astrometric foundation — the coordinate systems that give a position, the reference frames and epochs that anchor it, the time scales that say when, and the corrections, from precession to refraction, for every way the measured place differs from the true one.
- [From Telescope to Image](https://asteriastar.com/learn/from-telescope-to-image): Between a telescope and a finished picture lies a craft. A path through the techniques of observing — seeing by eye, capturing light with a camera, freezing the atmosphere for planetary detail, tracking faint galaxies for hours, and calibrating, stacking, and processing the raw frames into a faithful image.
- [The Astronomer's Toolkit](https://asteriastar.com/learn/the-astronomers-toolkit): Modern astronomy runs on software. A path through the ecosystem — the planetariums that show the sky, the suites that automate a night of imaging and process the results, the professional tools that calibrate and analyse data, and the libraries that compute positions and orbits.

## Compare
- [Mars vs Venus](https://asteriastar.com/compare/mars-vs-venus): Two terrestrial neighbors of Earth — a cold desert world and a scorching greenhouse.
- [Saturn vs Jupiter](https://asteriastar.com/compare/saturn-vs-jupiter): The two largest planets — both gas giants, with strikingly different characters.
- [James Webb vs Hubble](https://asteriastar.com/compare/jwst-vs-hubble): Two great space observatories — infrared pioneer and optical icon.
- [Betelgeuse vs Rigel](https://asteriastar.com/compare/betelgeuse-vs-rigel): Orion's two beacons — a cool red supergiant and a hot blue supergiant.
- [Galaxy vs Nebula](https://asteriastar.com/compare/galaxy-vs-nebula): Two very different deep-sky objects often confused with one another.
- [Astronomy vs Astrology](https://asteriastar.com/compare/astronomy-vs-astrology): The defining distinction on Asteria Star: evidence-based science versus interpretive cultural tradition.

## Timelines
- [Space Missions](https://asteriastar.com/timelines/space-missions): Landmark crewed and robotic missions of the space age.
- [Space Telescope Launches](https://asteriastar.com/timelines/telescope-launches): The orbiting observatories that opened new windows on the universe.
- [Planet & Dwarf-Planet Discoveries](https://asteriastar.com/timelines/planet-discoveries): When the outer worlds of the Solar System were found.
- [History of Astronomy](https://asteriastar.com/timelines/history-of-astronomy): Milestones in humanity's understanding of the universe, from ancient sky-watching to the age of gravitational waves — generated from the History of Astronomy knowledge graph.
- [The Universe Timeline](https://asteriastar.com/timelines/universe-timeline): The scientific history of the cosmos, from the Big Bang to the far future — with the real uncertainties acknowledged, not hidden.

Universal search: https://asteriastar.com/search

## Community (architecture preview)
Knowledge-first community architecture — no accounts, profiles, posts, feeds, or user data yet. User contributions will attach to graph entities; the graph stays the source of truth.
- [Community](https://asteriastar.com/community)
- [Observations](https://asteriastar.com/community/observations)
- [Astrophotography](https://asteriastar.com/community/astrophotography)
- [Collections](https://asteriastar.com/community/collections)
- [Contributors](https://asteriastar.com/community/contributors)
- [Learn Together](https://asteriastar.com/community/learning)
- [Explore Together](https://asteriastar.com/community/explore-together)

## Star Encyclopedia
An open encyclopedia of 2,944 real stars across all 88 constellations, generated from the open HYG database (Hipparcos + Yale Bright Star + Gliese), CC BY-SA 4.0. No fabricated stars, measurements, or catalog identifiers.
- [Star Encyclopedia](https://asteriastar.com/stars)
- Brightest: https://asteriastar.com/stars/discover/brightest · Nearest: https://asteriastar.com/stars/discover/nearest · Variable: https://asteriastar.com/stars/discover/variable
- Every star resolves through the Scientific Data Engine; pages at /stars/{slug} and /stars/type/{slug}. Full constellation entries live at /constellations/{slug}.

## Solar System Encyclopedia
A reference encyclopedia of the Solar System — 89 bodies (the Sun, 8 planets, dwarf planets, moons, asteroids, comets, missions, spacecraft, and surface features) as first-class entities, built on real NASA Planetary Fact Sheet + JPL data (public domain). No fabricated bodies or measurements.
- [Solar System Encyclopedia](https://asteriastar.com/solar-system)
- Planets: https://asteriastar.com/solar-system/discover/all-planets · Moons: https://asteriastar.com/solar-system/discover/natural-satellites · Missions: https://asteriastar.com/solar-system/discover/planetary-missions
- Every body resolves through the Scientific Data Engine; pages at /solar-system/{slug}.

## Deep Sky & Galaxy Encyclopedia
An encyclopedia of 619 real deep-sky objects — galaxies, nebulae, and star clusters — as first-class entities, built on the open OpenNGC database (NGC/IC, Messier, and Caldwell catalogues; CC BY-SA 4.0). The Messier and Caldwell catalogues are complete. No fabricated objects, identifiers, or measurements.
- [Deep Sky Encyclopedia](https://asteriastar.com/deep-sky)
- Galaxies: https://asteriastar.com/deep-sky/discover/all-galaxies · Nebulae: https://asteriastar.com/deep-sky/discover/all-nebulae · Messier: https://asteriastar.com/deep-sky/discover/messier-objects · Caldwell: https://asteriastar.com/deep-sky/discover/caldwell-objects
- Every object resolves through the Scientific Data Engine; pages at /deep-sky/{slug}.

## Space Exploration Encyclopedia
The history of human space exploration as a knowledge graph: 65 missions plus space agencies, mission programs, launch vehicles, launch sites, spacecraft, astronauts, and scientific instruments — 178 interconnected entities. Curated from authoritative public sources (NASA, ESA, JPL, national agencies). No fabricated missions, launch dates, or discoveries.
- [Space Exploration Encyclopedia](https://asteriastar.com/exploration)
- Missions: https://asteriastar.com/exploration/discover/all-missions · Human spaceflight: https://asteriastar.com/exploration/discover/human-spaceflight · Launch vehicles: https://asteriastar.com/exploration/discover/launch-vehicles · Agencies: https://asteriastar.com/exploration/discover/space-agencies
- Every mission, spacecraft, and agency resolves through the Scientific Data Engine; pages at /exploration/{slug}.

## Rockets & Launch Vehicles Encyclopedia
A source-backed encyclopedia of 55 launch vehicles plus rocket families, booster and upper stages, engines, propellants, launch providers, programs, and pads — 155 records resolving through the Scientific Data Engine (engine.launchVehicles). Curated from agency user's manuals and manufacturer documentation (NASA, ESA, JAXA, ISRO, Roscosmos, SpaceX, ULA, Arianespace, Rocket Lab, Blue Origin). Specifications that are not reliably known are left blank — never invented; no fabricated payloads, thrusts, specific impulses, or launch counts.
- [Rockets & Launch Vehicles](https://asteriastar.com/rockets)
- Launch vehicles: https://asteriastar.com/rockets/discover/all-launch-vehicles · Engines: https://asteriastar.com/rockets/discover/rocket-engines · Families: https://asteriastar.com/rockets/discover/rocket-families · Providers: https://asteriastar.com/rockets/discover/launch-providers
- Every rocket, engine, stage, and propellant resolves through the Scientific Data Engine; pages at /rockets/{slug}.

## Constellation Encyclopedia
All 88 official IAU constellations as first-class knowledge-graph entities (engine.constellations), each connected to its brightest stars, deep-sky objects, exoplanet hosts, meteor-shower radiants, mythology, family, and seasonal visibility. Boundaries, areas, and designations follow the International Astronomical Union; stars, deep-sky objects, exoplanets, and meteor showers are the platform's existing source-backed entities — reused, never duplicated. Unknown values are left blank; constellation visibility is not fabricated (the computed Live Sky tools are linked instead).
- [Constellations](https://asteriastar.com/constellations)
- All 88: https://asteriastar.com/constellations/discover/all-constellations · Zodiac: https://asteriastar.com/constellations/discover/zodiac · Families: https://asteriastar.com/constellations/family/zodiacal · Seasonal sky: https://asteriastar.com/constellations/season/winter
- Every constellation resolves through the Scientific Data Engine; pages at /constellations/{slug}, with family/season/region and discover sub-hubs.

## Satellite Encyclopedia
30 individual artificial satellites plus 11 constellations, 7 orbit types, 18 operators, and 3 tracking networks as first-class knowledge-graph entities (engine.satellites) — spanning communications, navigation, Earth observation, weather, and science. Agencies, launch vehicles, and launch sites are the platform's existing source-backed entities — reused, never duplicated. Specifications, launch dates, operators, and orbital parameters are never fabricated; unknown values are left blank. No real-time tracking is performed and no pass times are stated — the computed Live Sky tools are linked instead.
- [Satellites](https://asteriastar.com/satellites)
- All satellites: https://asteriastar.com/satellites/discover/all-satellites · Constellations: https://asteriastar.com/satellites/discover/constellations · Earth observation: https://asteriastar.com/satellites/discover/earth-observation · Orbits: https://asteriastar.com/satellites/orbit/leo
- Every satellite, constellation, orbit type, operator, and tracking network resolves through the Scientific Data Engine; pages at /satellites/{slug}, /satellites/constellation/{slug}, /satellites/orbit/{slug}, /satellites/operator/{slug}, and /satellites/network/{slug}.
## Asteroids & Minor Planets Encyclopedia
38 minor planets (asteroids and dwarf planets) plus 7 collisional families, 8 dynamical populations, 4 near-Earth classes, 4 Trojan groups, 4 orbital resonances, and 3 impact events as first-class knowledge-graph entities (engine.asteroids). Designations follow the IAU Minor Planet Center; orbits and sizes come from the NASA/JPL Small-Body Database. The five dwarf planets, the previously-modelled asteroids, and the small-body missions (Dawn, Hayabusa/2, OSIRIS-REx, DART, Psyche, Lucy…) are REUSED and never duplicated; reused bodies keep their canonical pages. A planetary-defense knowledge layer covers hazard scales, surveys, and deflection — factual and non-sensational. Sizes/orbits/discovery data are never fabricated; unknown values are left blank.
- [Asteroids & Minor Planets](https://asteriastar.com/asteroids)
- Largest: https://asteriastar.com/asteroids/discover/largest · Near-Earth: https://asteriastar.com/asteroids/discover/near-earth-objects · Trojans: https://asteriastar.com/asteroids/discover/trojans · Planetary defense: https://asteriastar.com/asteroids/planetary-defense
- New asteroids resolve at /asteroids/{slug}; families/groups/near-Earth classes/Trojans/resonances/impacts at /asteroids/{family,group,near-earth,trojans,resonance,impact}/{slug}.

## Comets & Small-Body Reservoirs Encyclopedia
25 comets and transition objects plus 5 dynamical classes, 1 genetic families, and 2 source reservoirs as first-class knowledge-graph entities (engine.comets). Designations and orbits come from the IAU Minor Planet Center and the NASA/JPL Small-Body Database. The ten comets already modelled, the meteor showers, the missions (Rosetta, Giotto, Stardust, Deep Impact…), and Program Y's trans-Neptunian reservoirs (Kuiper Belt, scattered disc, Centaurs) are REUSED and never duplicated; reused comets keep their canonical pages. Comets are linked to the meteor showers they parent (source_of_meteor_shower) and to their source reservoirs (belongs_to_reservoir). No live comet visibility or brightness is computed or fabricated — the Live Sky tools are linked instead.
- [Comets & Small-Body Reservoirs](https://asteriastar.com/comets)
- Periodic: https://asteriastar.com/comets/discover/periodic-comets · Great comets: https://asteriastar.com/comets/discover/great-comets · Meteor-shower parents: https://asteriastar.com/comets/discover/meteor-shower-parents · Oort cloud: https://asteriastar.com/comets/reservoir/oort-cloud
- New comets resolve at /comets/{slug}; classes/families/reservoirs at /comets/{class,family,reservoir}/{slug}; transition objects at /comets/{active,dormant}/{slug}.

## Meteors, Meteorites & Fireballs Encyclopedia
20 meteorites plus 4 classes, 8 groups, 2 fireballs, 4 impact structures, and 2 recovery sites as first-class knowledge-graph entities (engine.meteorites) — the capstone of the small-bodies trilogy (asteroids → comets → meteorites). Classifications and fall data come from the Meteoritical Bulletin Database. The parent bodies are REUSED graph entities: the asteroid Vesta (Program Y) for the HED meteorites, Mars for the Martian meteorites, and the Moon for the lunar meteorites (parent_body); the impact events and meteor showers are likewise reused, never duplicated. No live fireball detection is performed or fabricated — the Live Sky meteor-shower tools are linked instead.
- [Meteors, Meteorites & Fireballs](https://asteriastar.com/meteorites)
- Falls: https://asteriastar.com/meteorites/discover/falls · Carbonaceous: https://asteriastar.com/meteorites/discover/carbonaceous · Martian: https://asteriastar.com/meteorites/discover/martian · Impact structures: https://asteriastar.com/meteorites/discover/impact-structures
- Meteorites resolve at /meteorites/{slug}; classes/groups at /meteorites/{class,group}/{slug}; fireballs, impact structures, and recovery sites at /meteorites/{fireball,impact-structure,site}/{slug}.

## Interstellar & Hyperbolic Objects Encyclopedia
3 confirmed interstellar objects (1I/ʻOumuamua, 2I/Borisov, 3I/ATLAS) plus 1 debated candidate, 4 hyperbolic Solar-System comets, 3 detection methods, and 4 trajectory classes as first-class knowledge-graph entities (engine.interstellarObjects) — the coda to the small-body arc (asteroids → comets → meteorites → interstellar). Orbits and designations come from the IAU Minor Planet Center and the NASA/JPL Small-Body Database. HONEST STATUS is the governing rule: confirmed interstellar objects, unconfirmed candidates, and hyperbolic Solar-System comets are typed and displayed separately, and an interstellar origin (has_trajectory_class → interstellar-hyperbolic) is asserted ONLY for the confirmed objects; candidates such as the CNEOS 2014-01-08 bolide carry explicit uncertainty notes and are NEVER labelled confirmed. The reused comet class, Pan-STARRS / LSST, and NASA/JPL are never duplicated; new ATLAS/Catalina/Minor Planet Center/CNEOS entities are created. No "alien" or artificial-origin claims are made; no live visibility is computed or fabricated.
- [Interstellar & Hyperbolic Objects](https://asteriastar.com/interstellar-objects)
- Confirmed: https://asteriastar.com/interstellar-objects/discover/confirmed · Debated: https://asteriastar.com/interstellar-objects/discover/debated · Hyperbolic comets: https://asteriastar.com/interstellar-objects/discover/hyperbolic-comets · Detection: https://asteriastar.com/interstellar-objects/detection/excess-hyperbolic-velocity
- Objects/comets resolve at /interstellar-objects/{slug}; detection methods at /interstellar-objects/detection/{slug}; trajectory classes at /interstellar-objects/trajectory/{slug}.

## Small-Body Missions & Sample Return Encyclopedia
22 small-body missions (12 completed/extended, 3 active, 6 planned/concept) plus 6 mission classes, 4 returned samples, 4 sample-return capsules, 5 lifecycle phases, and 1 science campaign (engine.smallBodyMissions) — the engineering bridge across the small-body arc (asteroids/comets/meteorites/interstellar). Timelines, targets, launch vehicles, and sample masses come from NASA/JPL, ESA, and JAXA. The existing space missions (Hayabusa, OSIRIS-REx, Rosetta, DART, Lucy…), their rockets (Program V), and target asteroids/comets (Programs Y/Z) are REUSED and enriched, never duplicated — reused missions keep their canonical page, so their /small-body-missions view is excluded from the sitemap. HONEST TENSE: a planned/concept/cancelled mission asserts no past-tense encounter and no returned sample. No fabricated timelines, targets, or outcomes.
- [Small-Body Missions & Sample Return](https://asteriastar.com/small-body-missions)
- Sample return: https://asteriastar.com/small-body-missions/discover/sample-return · Planetary defense: https://asteriastar.com/small-body-missions/discover/planetary-defense · Comet missions: https://asteriastar.com/small-body-missions/discover/comet-missions · Timeline: https://asteriastar.com/small-body-missions/discover/mission-timeline
- Missions resolve at /small-body-missions/{slug} (reused ones canonical to their main page); mission classes at /small-body-missions/type/{slug}; returned samples at /small-body-missions/sample/{slug}.

## Deep Space Communications & Navigation Encyclopedia
8 communication networks, 12 deep-space tracking stations, 4 near-Earth ground stations, 8 antennas, 5 signal bands, 7 navigation systems, and timing/communication systems (engine.deepSpaceCommunications) — the infrastructure layer beneath nearly every space program. Capabilities and antenna sizes come from NASA/JPL, ESA, and JAXA. The Deep Space Network, Estrack, and Near Space Network already exist as tracking_network entities and are REUSED and enriched (never duplicated) — reused networks keep their canonical page, so their /deep-space-network view is excluded from the sitemap; mission-support links reuse the existing spacecraft (Voyager, Cassini, JWST, Rosetta, Hayabusa, Psyche…). Signal light-time is real physics (distance ÷ the speed of light), never a fabricated fixed delay. No fabricated capabilities, antenna sizes, or coverage.
- [Deep Space Communications & Navigation](https://asteriastar.com/deep-space-network)
- Tracking stations: https://asteriastar.com/deep-space-network/discover/tracking-stations · Signal bands: https://asteriastar.com/deep-space-network/band/x-band · Navigation: https://asteriastar.com/deep-space-network/discover/navigation · Laser comms: https://asteriastar.com/deep-space-network/discover/laser-communications
- Networks resolve at /deep-space-network/network/{slug} (reused ones canonical to their existing page); stations at /deep-space-network/station/{slug}; antennas, bands, and navigation at /deep-space-network/{antenna,band,navigation}/{slug}.

## Space Environment & Hazards Encyclopedia
22 space-weather phenomena, radiation environments, hazards, and indices (engine.spaceEnvironment) — the scientific layer of the hazards of space. Curated from NASA and NOAA. The Sun, planets, moons, and solar missions (Parker, Solar Orbiter) are REUSED; SOHO/SDO/ACE/DSCOVR and NOAA SWPC are added. No live conditions or forecasts are stated — NOAA SWPC is the operational source. No fabricated values.
- [Space Environment & Hazards](https://asteriastar.com/space-environment)
- Space weather: https://asteriastar.com/space-environment/discover/space-weather · Radiation: https://asteriastar.com/space-environment/discover/radiation · Hazards: https://asteriastar.com/space-environment/discover/hazards

## Ground Segment & Mission Operations Encyclopedia
8 mission operations centres and 16 operational functions (engine.missionOperations) — the operational infrastructure behind every mission. Curated from NASA, ESA, JAXA, ISRO, Roscosmos, and CNSA. The agencies, the tracking networks (DSN, Estrack), and the missions are REUSED, never duplicated. No fabricated data.
- [Ground Segment & Mission Operations](https://asteriastar.com/mission-operations)
- Centres: https://asteriastar.com/mission-operations/discover/operations-centers · Flight dynamics: https://asteriastar.com/mission-operations/discover/flight-dynamics · Lifecycle: https://asteriastar.com/mission-operations/discover/mission-lifecycle

## Spacecraft Systems & Engineering Encyclopedia
10 spacecraft subsystems and 25 components (engine.spacecraftSystems) — the engineering layer of spacecraft: structure, thermal, power, propulsion, attitude control, avionics, telecommunications, EDL, and robotics. Curated from NASA, ESA, and engineering references. The docking systems, life-support systems (ECLSS), antennas, and attitude sensors are REUSED, never duplicated. No fabricated data.
- [Spacecraft Systems & Engineering](https://asteriastar.com/spacecraft-systems)
- Power: https://asteriastar.com/spacecraft-systems/discover/power · Propulsion: https://asteriastar.com/spacecraft-systems/discover/propulsion · Avionics: https://asteriastar.com/spacecraft-systems/discover/avionics

## Scientific Instruments & Payloads Encyclopedia
12 instrument classes and 16 notable instruments (engine.instruments) — the science-payload layer: cameras, spectrometers, magnetometers, particle/dust detectors, radar, laser altimeters, seismometers, and radio science. Curated from NASA and ESA. The many scientific_instrument entities already in the graph (Mars, JWST, Hubble, Juno, ground telescopes) are REUSED and enriched with their class, never duplicated; new instruments link to their reused host missions. No fabricated data.
- [Scientific Instruments & Payloads](https://asteriastar.com/instruments)
- Classes: https://asteriastar.com/instruments/discover/classes · Imaging: https://asteriastar.com/instruments/discover/imaging · Spectroscopy: https://asteriastar.com/instruments/discover/spectroscopy

## Planetary Geology & Surface Features Encyclopedia
18 geological feature types and 26 named surface features (engine.planetaryGeology) — the geology of the Solar System: impact craters and basins, volcanoes and cryovolcanoes, canyons, dunes, chaos terrain, ice plains, and hydrocarbon lakes across Mars, the Moon, Mercury, Venus, Ceres, Vesta, the icy moons, and Pluto. Curated from NASA/JPL. The planets, moons, dwarf planets, and existing surface_feature entities are REUSED and enriched, never duplicated. No fabricated data.
- [Planetary Geology & Surface Features](https://asteriastar.com/planetary-geology)
- Impact: https://asteriastar.com/planetary-geology/discover/impact · Volcanic: https://asteriastar.com/planetary-geology/discover/volcanic · Icy: https://asteriastar.com/planetary-geology/discover/icy

## Space Missions Timeline & Historical Events Encyclopedia
7 eras and 42 dated events plus milestone firsts and standing records (engine.spaceflightHistory) — the chronological history of spaceflight, from Sputnik and Gagarin through Apollo, the Space Shuttle, the ISS, Voyager, Cassini, and New Horizons to Artemis. Curated from NASA, ESA, and national space-agency records. Every era, event, milestone, and record links to the REUSED missions, mission programs, astronauts, agencies, stations, telescopes, and worlds it concerns; those entities are never duplicated. Dates are given only to the precision that is well established. No fabricated events or dates.
- [Space Missions Timeline & Historical Events](https://asteriastar.com/timeline)
- Master timeline: https://asteriastar.com/timeline/discover/master-timeline · Firsts: https://asteriastar.com/timeline/discover/firsts-and-milestones · Records: https://asteriastar.com/timeline/discover/records

## Life Support, Space Biology & Space Medicine Encyclopedia
5 disciplines and 5 physiological effects plus life-support technologies and countermeasures (engine.spaceMedicine) — the human-in-space layer: how microgravity and radiation change the body (bone and muscle loss, fluid shift, SANS vision changes, immune and radiation effects), the ECLSS technologies that keep a crew alive (oxygen, CO2 removal, water recovery, food, closed ecosystems), and the countermeasures (exercise, nutrition, shielding, lighting, psychological support). Curated from NASA and ESA human-research sources. Reuses the ECLSS life-support system, the radiation environments, the space stations, and the astronauts already in the graph; countermeasures link to the effects they mitigate. Quantitative figures are omitted unless well established. No fabricated data.
- [Life Support, Space Biology & Space Medicine](https://asteriastar.com/space-medicine)
- Effects: https://asteriastar.com/space-medicine/discover/physiological-effects · Countermeasures: https://asteriastar.com/space-medicine/discover/countermeasures · Life support: https://asteriastar.com/space-medicine/discover/life-support-technologies

## Space Manufacturing & In-Space Infrastructure Encyclopedia
5 domains and 21 technologies (engine.spaceInfrastructure) — the future engineering layer: in-situ resource utilisation (water, oxygen, metals, and propellant from the Moon, Mars, and asteroids), in-space manufacturing (3D printing, in-space assembly, servicing, autonomous construction), and the infrastructure of a spacefaring economy (propellant depots, commercial and inflatable habitats, lunar bases, solar-power satellites, surface fission power, space tugs, orbital refuelling, and megastructure concepts such as space elevators and mass drivers). Curated from NASA and ESA. Reuses the Moon, Mars, metal asteroids, the commercial/inflatable stations (Gateway, Axiom, Genesis), the propellants, and the components already in the graph. Technology maturity is stated honestly — from operational (ISS 3D printing, MOXIE oxygen on Mars) to purely theoretical (space elevator). No fabricated data.
- [Space Manufacturing & In-Space Infrastructure](https://asteriastar.com/space-infrastructure)
- ISRU: https://asteriastar.com/space-infrastructure/discover/resource-utilisation · Manufacturing: https://asteriastar.com/space-infrastructure/discover/manufacturing · Infrastructure: https://asteriastar.com/space-infrastructure/discover/infrastructure-systems

## Future Space Exploration & Mission Concepts Encyclopedia
7 themes and 12 planned missions and concepts (engine.futureMissions) — a future-exploration authority: the Artemis return to the Moon (Artemis II & III), Mars Sample Return, the Venus fleet (DAVINCI, VERITAS, EnVision), the ocean worlds (Dragonfly, plus the reused Europa Clipper and JUICE), the next great observatories (the reused Roman plus Habitable Worlds Observatory, LISA, Athena), planetary defence (NEO Surveyor), and the outer Solar System (a Uranus orbiter, Interstellar Probe). Only official or credible concepts are included. Each states its status, agency, timeline, goals, target, technology, and uncertainties HONESTLY — dates only when publicly stated. Reuses the in-development missions, agencies, and target bodies already in the graph; nothing duplicated or fabricated.
- [Future Space Exploration & Mission Concepts](https://asteriastar.com/future-exploration)
- Human & lunar: https://asteriastar.com/future-exploration/discover/human-and-lunar · Planetary: https://asteriastar.com/future-exploration/discover/planetary-missions · Observatories: https://asteriastar.com/future-exploration/discover/future-observatories

## Astronomy Methods, Measurements & Scientific Techniques Encyclopedia
8 categories and 26 techniques (engine.astronomyMethods) — how astronomy actually works: astrometry and parallax, photometry and the magnitude system, spectroscopy and spectral classification, interferometry and adaptive optics, the cosmic distance ladder (Cepheids, standard candles, redshift and the Hubble–Lemaître law), helioseismology and asteroseismology, gravitational lensing, gravitational-wave detection, neutrino and multi-messenger astronomy, CMB measurements, galaxy rotation curves and black-hole mass measurement, and the error analysis, calibration, and honest uncertainty that make a measurement science. Curated from NASA and ESA. Reuses the exoplanet-detection methods, cosmology concepts, observing bands, Gaia, and the Harvard classification already in the graph; nothing duplicated or fabricated. Uncertainty is part of the method, not hidden.
- [Astronomy Methods, Measurements & Techniques](https://asteriastar.com/methods)
- Distances: https://asteriastar.com/methods/discover/the-distance-ladder · Light & spectra: https://asteriastar.com/methods/discover/light-and-spectra · Beyond light: https://asteriastar.com/methods/discover/beyond-light

## Multi-Wavelength & Time-Domain Astronomy Atlas
12 reused wavelength/messenger bands and 12 transient classes plus alert infrastructure and workflow stages (engine.timeDomain) — how the dynamic universe is observed across radio, infrared, optical, UV, X-ray and gamma-ray light and through gravitational waves, neutrinos, and cosmic rays. Transient classes: Type Ia and core-collapse supernovae, hypernovae, novae, gamma-ray bursts, magnetar flares, kilonovae, compact-binary mergers, tidal disruption events, fast radio bursts, and cataclysmic/eruptive variables. Alert infrastructure: GCN, VOEvent, the Transient Name Server, the Astronomer's Telegram, and the Rubin alert stream. Workflow: discovery → follow-up → confirmation → classification → publication. Curated from NASA and ESA. The multi-wavelength axis REUSES the existing observing bands (at /observatories/{band}), the multi-messenger methods, and the surveys/observatories; nothing duplicated or fabricated.
- [Multi-Wavelength & Time-Domain Astronomy](https://asteriastar.com/time-domain)
- Explosive: https://asteriastar.com/time-domain/discover/explosive-transients · Relativistic & mergers: https://asteriastar.com/time-domain/discover/relativistic-and-mergers · Alerts: https://asteriastar.com/time-domain/discover/alert-infrastructure

## Galaxies, AGN & the Extragalactic Universe Encyclopedia
8 galaxy morphologies, 4 AGN types, 6 galactic processes, and 6 named cosmic structures (engine.galaxies) — the extragalactic universe: galaxy morphology (spiral, barred, elliptical, lenticular, irregular, ring, dwarf, peculiar); active galactic nuclei (Seyfert, LINER, radio galaxy, BL Lac, and the unified model); galaxy evolution (mergers, interactions, starbursts, black-hole feedback, quenching); and large-scale structure (the Local Group, the Virgo and Coma clusters, Laniakea, the Sloan Great Wall, the Boötes Void). Curated from NASA and ESA. REUSES the platform's galaxies (Andromeda, M87, M82, Centaurus A, the Antennae, the Magellanic Clouds), the astrophysical object classes (AGN, quasar, blazar, galaxy cluster, supercluster, cosmic filament, void, dark-matter halo, supermassive black hole), and the cosmology concepts (the cosmic web, large-scale structure, dark matter); nothing duplicated or fabricated.
- [Galaxies, AGN & the Extragalactic Universe](https://asteriastar.com/galaxies)
- Morphology: https://asteriastar.com/galaxies/discover/galaxy-morphology · AGN: https://asteriastar.com/galaxies/discover/active-galactic-nuclei · Structures: https://asteriastar.com/galaxies/discover/cosmic-structures

## Astrobiology, Biosignatures & the Search for Life Encyclopedia
6 disciplines, 4 biosignatures, and habitability factors and planetary-protection measures (engine.astrobiology) — the science of life beyond Earth: origins of life, planetary habitability (liquid water, energy, chemical building blocks, extremophiles, subsurface oceans), the ocean worlds (Europa, Enceladus, Titan), biosignatures (atmospheric, surface, chemical, geological) and the FALSE POSITIVES that must be ruled out, technosignatures and SETI, and planetary protection (forward/backward contamination, sample handling). Curated from NASA and ESA. REUSES the ocean-world moons, Mars, the habitable-zone concept, the SETI Institute, the Europa Clipper/Dragonfly/Perseverance missions, and spectroscopy already in the graph. No claim of extraterrestrial life is asserted; biosignatures are potential and false positives are treated seriously. Nothing duplicated or fabricated.
- [Astrobiology, Biosignatures & the Search for Life](https://asteriastar.com/astrobiology)
- Biosignatures: https://asteriastar.com/astrobiology/discover/biosignatures · Habitability: https://asteriastar.com/astrobiology/discover/habitability · Planetary protection: https://asteriastar.com/astrobiology/discover/planetary-protection

## Planetary Defense & NEO Operations Encyclopedia
A 8-stage NEO operations pipeline plus impact-risk scales and deflection methods (engine.planetaryDefense) — the end-to-end system to find, track, assess, and deflect a hazardous near-Earth object. Pipeline: discovery → orbit determination → characterization → impact monitoring → risk assessment → risk communication → decision & planning → deflection. Risk scales: the Torino and Palermo scales. Deflection methods with honest maturity: kinetic impactor (DEMONSTRATED by DART on Dimorphos in 2022), gravity tractor and ion-beam (concepts), nuclear (THEORETICAL, never tested, last resort). Curated from NASA, ESA, and the Minor Planet Center. REUSES the survey telescopes (Catalina, Pan-STARRS, ATLAS, LSST, Rubin), the Minor Planet Center and CNEOS, the DART and Hera missions and the NEO Surveyor concept, the near-Earth-object classes, and the asteroids Apophis and Bennu; nothing duplicated or fabricated.
- [Planetary Defense & NEO Operations](https://asteriastar.com/planetary-defense)
- NEO pipeline: https://asteriastar.com/planetary-defense/discover/the-neo-pipeline · Risk scales: https://asteriastar.com/planetary-defense/discover/risk-scales · Deflection: https://asteriastar.com/planetary-defense/discover/deflection-methods

## Space Data Archives & Open Science Infrastructure Encyclopedia
The 10 great science archives plus data standards, Virtual Observatory protocols, and open-science practices (engine.dataArchives) — where astronomy's data lives and how it is shared. Archives: MAST (Hubble, JWST, TESS, Kepler — STScI), the ESA science archives, IRSA (Spitzer, WISE, 2MASS — Caltech/IPAC), HEASARC (Chandra, Swift, Fermi), NED, and the Strasbourg CDS with SIMBAD and VizieR; plus the ESO and ALMA archives. Data standards: FITS, VOTable, ASDF. Virtual Observatory: the IVOA framework, TAP, Cone Search, Simple Image Access, Simple Spectral Access. Open science: data pipelines and calibration, cross-matching, the ADS literature service, persistent identifiers (DOIs, ORCID, bibcodes), and FAIR reproducibility. Curated from NASA, ESA, ESO, and the archive operators. REUSES the operating organisations (STScI, ESO, Caltech/IPAC, NASA, NRAO, NAOJ), the telescopes and surveys whose data the archives hold, the calibration method, the Harvard classification, and VOEvent; nothing duplicated or fabricated.
- [Space Data Archives & Open Science](https://asteriastar.com/data-archives)
- Archives: https://asteriastar.com/data-archives/discover/the-archives · Data standards: https://asteriastar.com/data-archives/discover/data-standards · Virtual Observatory: https://asteriastar.com/data-archives/discover/the-virtual-observatory · Open science: https://asteriastar.com/data-archives/discover/open-science

## Ground-Based Observatories & Instrumentation Frontier Encyclopedia
The 3 next-generation ground facilities still missing from the graph plus the instrumentation, detector, interferometry, and observing techniques of modern astronomy (engine.observatoryFrontier). Facilities (created with the existing telescope/observatory types, honest construction status): the Giant Magellan Telescope (under construction), the ngVLA (proposed), and the Cherenkov Telescope Array (under construction). Instrumentation: laser guide stars, wavefront sensors, deformable mirrors, echelle and integral-field spectrographs, coronagraphs, starshades. Detectors: CCD, CMOS, MKID, bolometer, cryogenic detectors. Interferometry: radio, optical, VLBI, aperture synthesis. Observing techniques: lucky imaging, speckle imaging, image stacking, fringe tracking. Curated from ESO, NOIRLab, NRAO, and NASA. REUSES the ground observatories (ELT, TMT, Rubin, Keck, Subaru, VLT, Gemini, ALMA, SKA, VLA, MeerKAT, LOFAR), the adaptive-optics/interferometry/spectroscopy methods, the SPHERE, MUSE and HIRES instruments, and the wavelength bands; nothing duplicated or fabricated.
- [Observatories & Instrumentation Frontier](https://asteriastar.com/observatory-frontier)
- Facilities: https://asteriastar.com/observatory-frontier/discover/next-generation-facilities · Instrumentation: https://asteriastar.com/observatory-frontier/discover/instrumentation · Detectors: https://asteriastar.com/observatory-frontier/discover/detectors · Interferometry: https://asteriastar.com/observatory-frontier/discover/interferometry · Techniques: https://asteriastar.com/observatory-frontier/discover/observing-techniques

## Cosmic Distance Ladder & Cosmological Tensions Encyclopedia
The complete distance-measurement layer of modern cosmology plus the cosmological parameters and the Hubble tension (engine.distanceLadder). Distance indicators (the rungs still missing from the graph): RR Lyrae, tip of the red giant branch, surface brightness fluctuations, the Tully–Fisher and Faber–Jackson relations, water megamaser distances, and standard sirens — reusing parallax, the Cepheid scale, Type Ia supernovae, BAO, and the CMB. Cosmological parameters: matter density (Ωm), dark-energy density (ΩΛ), the amplitude of fluctuations (σ8), and the scalar spectral index (ns) — the Hubble constant (H0) is reused. The Hubble tension: the SH0ES local-ladder programme (created with the existing observational-programme type) versus the early-universe (Planck) value, and early dark energy (created with the existing cosmology-concept type) as one proposed, unconfirmed resolution. Curated from Planck, SH0ES, and the gravitational-wave observatories; measured values are not invented. REUSES the Hubble constant and tension, dark energy and dark matter, and the Planck, Gaia, Hubble, and JWST facilities; nothing duplicated or fabricated.
- [Cosmic Distance Ladder & Cosmological Tensions](https://asteriastar.com/distance-ladder)
- The ladder: https://asteriastar.com/distance-ladder/discover/the-distance-ladder · Parameters: https://asteriastar.com/distance-ladder/discover/cosmological-parameters · The Hubble tension: https://asteriastar.com/distance-ladder/discover/the-hubble-tension

## Heliophysics & Space Weather Operations Encyclopedia
The operational layer of heliophysics — how the Sun drives space weather and how that weather reaches technology and people (engine.heliophysics). Solar sources (created with the existing space-weather-phenomenon type): the solar cycle, sunspots, active regions, coronal holes, and the ionosphere. Operational impacts (a new type): satellites, GPS and navigation, aviation, human spaceflight, power grids, and radio communications. Forecasting: ESA's Space Weather Service Network (created with the existing organization type, matching NOAA's SWPC), the European counterpart to NOAA's SWPC. Curated from NOAA SWPC, NASA, and ESA. REUSES the space-weather phenomena (solar flares, CMEs, the solar wind, the heliosphere, geomagnetic storms, the magnetosphere, the aurora), the NOAA G/S/R scales, the solar-energetic-particle and Van Allen radiation environments, the Parker Solar Probe, Solar Orbiter, DSCOVR and ACE missions, and the SWPC; nothing duplicated or fabricated.
- [Heliophysics & Space Weather Operations](https://asteriastar.com/heliophysics)
- Solar sources: https://asteriastar.com/heliophysics/discover/solar-sources · Operational impacts: https://asteriastar.com/heliophysics/discover/operational-impacts · Forecasting: https://asteriastar.com/heliophysics/discover/forecasting

## Solar Physics, Heliosphere & Solar Observatory Encyclopedia
The Sun from its core to the edge of the heliosphere (engine.solarPhysics), 32 entries. The concentric interior (core, radiative zone, convection zone, tachocline) and atmosphere (photosphere, chromosphere, transition region, corona) as solar_region entities; the surface and atmospheric features (granulation, supergranulation, prominence, filament, plage, spicule, coronal loop, streamer, polar plume) as solar_feature entities; the solar-physics processes and cycle and wind concepts (solar dynamo, magnetic reconnection, differential rotation, the coronal-heating problem, nanoflare heating, the butterfly diagram, the Maunder and Dalton minima, irradiance variation, fast and slow solar wind) created with the existing stellar_physics_concept type; and the heliosphere structures (Parker spiral, termination shock, heliosheath, bow wave) as heliosphere_structure entities. Curated from NASA, ESA, and the solar-physics literature. HONESTY: only well-established solar physics is stated; open questions (coronal heating; whether the heliospheric boundary is a bow shock or a gentler bow wave) are flagged; measured values (~15 million K core, ~5,772 K photosphere, ~90 AU termination shock, ~0.1% irradiance variation) are given only where firmly known. REUSES the Sun (star:sun), the space-weather phenomena (solar wind, flare, CME, sunspot, coronal hole, active region, solar cycle, heliosphere, heliopause), helioseismology, and the solar observatories (SOHO, SDO, Hinode, Parker Solar Probe, Solar Orbiter, DKIST) and the Voyagers; nothing duplicated or fabricated.
- [Solar Physics & Heliosphere](https://asteriastar.com/solar-physics)
- Inside the Sun: https://asteriastar.com/solar-physics/discover/solar-interior · Atmosphere: https://asteriastar.com/solar-physics/discover/solar-atmosphere · Activity & cycle: https://asteriastar.com/solar-physics/discover/solar-activity · Wind & heliosphere: https://asteriastar.com/solar-physics/discover/solar-wind-and-heliosphere

## Black Holes, Neutron Stars & Compact Objects Encyclopedia
The end-states of gravity (engine.compactObjects), 26 entries. Black-hole physics — the ergosphere, photon sphere, innermost stable circular orbit, gravitational singularity, no-hair theorem, frame-dragging, gravitational redshift, spaghettification — and processes — relativistic jets, the Blandford–Znajek mechanism, quasi-periodic oscillations, Bondi accretion — created with the existing cosmology_concept type, alongside the event horizon. Neutron-star physics (neutron degeneracy pressure, the equation of state, the pulsar mechanism, glitches, magnetar fields) created with the existing stellar_physics_concept type. The pulsar family (ordinary, millisecond, X-ray, rotation-powered) created with the existing astrophysical_object_class type. Specific objects: the black holes Cygnus X-1 (~21 M☉, the first widely accepted) and V404 Cygni (~9 M☉) as black_hole entities, and the neutron stars (the Crab Pulsar in the 1054 supernova remnant, the glitching Vela Pulsar, the first pulsar PSR B1919+21, and the ~2.08 M☉ PSR J0740+6620) as a new neutron_star type. Curated from NASA, ESO, and the astrophysics literature. HONESTY: only well-established astrophysics is stated; open questions (the neutron-star equation of state; how jets are launched; the singularity) are flagged; masses and distances appear only where firmly measured. REUSES the black-hole, supermassive/intermediate/primordial/stellar, neutron-star and magnetar classes, the Sgr A* and M87* black holes, the event horizon / Hawking radiation / accretion disk / Schwarzschild radius, the merger/kilonova/tidal-disruption transients, the Event Horizon Telescope, the gravitational-wave and black-hole-mass methods, and the Crab Nebula; nothing duplicated or fabricated.
- [Black Holes, Neutron Stars & Compact Objects](https://asteriastar.com/compact-objects)
- Black-hole physics: https://asteriastar.com/compact-objects/discover/black-hole-physics · Neutron stars & pulsars: https://asteriastar.com/compact-objects/discover/neutron-stars-and-pulsars · Named objects: https://asteriastar.com/compact-objects/discover/compact-objects

## Data Science, AI & Machine Learning in Astronomy Encyclopedia
The computational layer of modern astronomy (engine.astroMl). ML methods: classification, regression, clustering, representation learning, self-supervised learning, foundation models, anomaly detection. Applications: galaxy morphology classification, supernova classification, photometric redshifts, transit detection, strong-lens finding, source extraction, real-time alert classification. Community alert brokers (created with the existing alert-system type): ALeRCE, ANTARES, Fink, Lasair. Data engineering: training datasets, benchmark datasets, feature extraction, model evaluation. Curated from NASA, NOIRLab, and the Rubin/LSST community; benchmark datasets and brokers are named only where real. REUSES the Rubin Observatory and its alert stream, the Transient Name Server, the photometry, gravitational-lensing and spectral-classification methods, the galaxy morphologies, the transit exoplanet method, the Type Ia supernova class, the redshift concept, and the reproducibility, data-pipeline and cross-matching practices; nothing duplicated or fabricated.
- [Data Science, AI & Machine Learning in Astronomy](https://asteriastar.com/astro-ml)
- ML methods: https://asteriastar.com/astro-ml/discover/ml-methods · Applications: https://asteriastar.com/astro-ml/discover/applications · Alert brokers: https://asteriastar.com/astro-ml/discover/alert-brokers · Data engineering: https://asteriastar.com/astro-ml/discover/data-engineering

## Citizen Science, Amateur Astronomy & Public Observing Encyclopedia
The public participation layer of astronomy — how anyone can take part, and how amateurs still do real science (engine.citizenAstronomy). Citizen-science projects: Zooniverse, Galaxy Zoo, Planet Hunters, Globe at Night, Aurorasaurus, Stardust@home. Amateur activities: backyard observing, variable-star observing, asteroid and comet observing, occultation timing, meteor observing. Observing equipment: binoculars, Dobsonian telescope, equatorial mount, star tracker, camera, astronomical filter. Public outreach: star parties, public observatories, dark-sky parks, astronomy education. Amateur organisations (created with the existing organization type): the AAVSO, the International Meteor Organization, and ALPO. Curated from NASA and the citizen-science and amateur-astronomy communities; projects and organisations are named only where real. REUSES the aurora, the stellar-occultation and photometry methods, the meteor showers and constellations, the eruptive-variable-star class, the Stardust mission, the transit exoplanet method, the galaxy-morphology-classification ML application, the Rubin Observatory, and the MAST archive; nothing duplicated or fabricated.
- [Citizen Science, Amateur Astronomy & Public Observing](https://asteriastar.com/citizen-astronomy)
- Citizen science: https://asteriastar.com/citizen-astronomy/discover/citizen-science · Amateur observing: https://asteriastar.com/citizen-astronomy/discover/amateur-observing · Equipment: https://asteriastar.com/citizen-astronomy/discover/equipment · Outreach: https://asteriastar.com/citizen-astronomy/discover/public-outreach

## Multi-Messenger & Gravitational-Wave Operations Encyclopedia
The knowledge layer of modern multi-messenger astronomy (engine.multiMessenger). Gravitational-wave detectors (created with the existing observatory/mission-concept types): the operating GEO600 testbed, the proposed next-generation Einstein Telescope and Cosmic Explorer, and the space missions DECIGO, Taiji, TianQin. Detection methods: laser interferometry, space interferometry, pulsar timing arrays. Compact-binary-merger source classes (existing transient-class type): binary black hole, binary neutron star, black hole–neutron star mergers. Alert systems (existing alert-system type): the LVK public alerts and SCiMMA. Multi-messenger channels: GW with light, neutrinos, gamma rays, radio, and optical. Follow-up: localization, counterpart search, rapid response. Data products: sky-localization maps, waveforms, parameter estimation, the GWTC catalog. Curated from the LIGO-Virgo-KAGRA collaboration, NASA, and ESA; proposed detectors stated as such. REUSES the LIGO/Virgo/KAGRA detectors and the LISA concept, the gravitational-wave/multi-messenger/neutrino methods, the kilonova/GRB/FRB/TDE transient classes, the GCN/VOEvent/TNS alert systems, the standard-siren distance indicator, and the gravitational-wave and multi-messenger bands; nothing duplicated or fabricated.
- [Multi-Messenger & Gravitational-Wave Operations](https://asteriastar.com/multi-messenger)
- Observatories: https://asteriastar.com/multi-messenger/discover/observatories · Source classes: https://asteriastar.com/multi-messenger/discover/source-classes · Multi-messenger: https://asteriastar.com/multi-messenger/discover/multi-messenger · Follow-up: https://asteriastar.com/multi-messenger/discover/follow-up

## Comparative Planetology & Planetary Atmospheres Encyclopedia
How planets and moons evolve, compared across the Solar System and beyond (engine.comparativePlanetology). Interior layers: core, mantle, crust. Planetary processes: differentiation, plate tectonics (known for certain only on Earth), volcanism, cryovolcanism, atmospheric escape, climate evolution, the greenhouse effect, atmospheric circulation, magnetospheric shielding, impact cratering. World-types (created with the existing planetary-class type): ocean worlds, lava worlds, and the proposed hycean planets. Curated from NASA and the planetary-science community; hypothetical world-types labelled as proposed. REUSES the planets (Mercury–Neptune), the moons (Titan, Europa, Enceladus, Io, Triton), Pluto, the super-Earth/mini-Neptune/hot-Jupiter classes, the magnetosphere, the cryovolcano feature, the habitable zone, and the ocean-worlds theme; nothing duplicated or fabricated.
- [Comparative Planetology & Planetary Atmospheres](https://asteriastar.com/comparative-planetology)
- Interiors: https://asteriastar.com/comparative-planetology/discover/planetary-interiors · Processes: https://asteriastar.com/comparative-planetology/discover/planetary-processes · World types: https://asteriastar.com/comparative-planetology/discover/world-types

## Astrochemistry & the Molecular Universe Encyclopedia
How chemistry builds stars, planets, and the ingredients of life (engine.astrochemistry). Interstellar environments: the diffuse interstellar medium, molecular clouds, star-forming regions, protoplanetary disks, interstellar dust. Molecules: water, carbon monoxide (the tracer of molecular gas), carbon dioxide, ammonia, hydrogen cyanide, methanol, polycyclic aromatic hydrocarbons (PAHs), and amino-acid precursors. Astrochemical processes: gas-phase chemistry, grain-surface chemistry, photochemistry, shock chemistry, prebiotic chemistry, planet-formation chemistry, and cometary & meteoritic chemistry. Curated from NASA, ESO/ALMA, and the astrochemistry community. REUSES the spectroscopy method, ALMA and APEX, the James Webb Space Telescope, the Orion Nebula, the origins-of-life topic, the Murchison and Allende meteorites, and the infrared/radio/submillimetre/ultraviolet bands; nothing duplicated or fabricated.
- [Astrochemistry & the Molecular Universe](https://asteriastar.com/astrochemistry)
- Environments: https://asteriastar.com/astrochemistry/discover/interstellar-environments · Molecules: https://asteriastar.com/astrochemistry/discover/molecules · Processes: https://asteriastar.com/astrochemistry/discover/processes

## Space Policy, Sustainability & the Space Economy Encyclopedia
The institutional and operational layer of modern space activity (engine.spacePolicy). Space-law treaties: the Outer Space Treaty (1967), the Liability Convention (1972), the Registration Convention (1975), the Moon Agreement (1979), and the Artemis Accords (2020). Policy & sustainability topics: orbital debris, the Kessler syndrome, space situational awareness, space traffic management, debris mitigation, mega-constellations, launch licensing, spectrum & orbital-slot allocation, export control & dual-use, space-resource policy, and planetary-protection policy. Space-economy topics: commercial launch, the satellite economy, space insurance, and the space economy. Governing bodies (created with the existing organization type): UNOOSA, COSPAR, the ITU, and the IAF. Curated from the UN space treaties, UNOOSA, COSPAR, and NASA; treaty years are historical facts. REUSES the on-orbit-servicing process, the in-situ-resource-utilisation domain, the planetary-protection topic and its contamination measures, the space-weather satellite impact, and NASA; nothing duplicated or fabricated.
- [Space Policy, Sustainability & the Space Economy](https://asteriastar.com/space-policy)
- Space law: https://asteriastar.com/space-policy/discover/space-law · Sustainability: https://asteriastar.com/space-policy/discover/sustainability · Space economy: https://asteriastar.com/space-policy/discover/space-economy · Organisations: https://asteriastar.com/space-policy/discover/organisations

## History & Philosophy of Astronomical Discovery Encyclopedia
How astronomy became modern science, and how it knows what it knows (engine.discoveryHistory). Histories of discovery: the Copernican Revolution and the histories of the telescope, spectroscopy, radio astronomy, cosmology, exoplanets, gravitational waves, and black holes. Discovery methodologies: the scientific method, paradigm shifts, scientific revolutions, instrumentation-driven discovery, observational bias, theory & observation, Big Science, the data & AI revolution. Philosophy of science: scientific realism, falsifiability, the nature of evidence, measurement uncertainty, replication & reproducibility, open science. Curated from the history and philosophy of science and NASA. REUSES the astronomers (Copernicus, Galileo, Kepler, Newton, Herschel, Hubble), the astronomy eras, the spectroscopy/gravitational-wave/error-analysis methods, the transit method, the Hubble tension, Sagittarius A*, the radio band, and the reproducibility practice; nothing duplicated or fabricated.
- [History & Philosophy of Astronomical Discovery](https://asteriastar.com/discovery-history)
- Histories: https://asteriastar.com/discovery-history/discover/histories · Methodology: https://asteriastar.com/discovery-history/discover/methodology · Philosophy: https://asteriastar.com/discovery-history/discover/philosophy

## Celestial Mechanics & Timekeeping Encyclopedia
The mathematical foundation of how bodies move and how time is kept (engine.celestialMechanics). Orbital mechanics (building on the reused Kepler's laws): the restricted three-body problem, N-body dynamics, Lagrange points, the Hill sphere, the Roche limit, orbital perturbations, mean-motion and secular resonances, tidal evolution, spin-orbit coupling, orbital elements. Reference frames & epochs: the ICRS, BCRS, GCRS, the ecliptic, J2000, B1950. Ephemeris systems: the JPL Development Ephemeris, the SPICE toolkit, JPL Horizons. Time standards (created with the existing time-standard type): Terrestrial Time (TAI + 32.184 s), Barycentric Dynamical Time, UT1, the leap second, sidereal time, apparent solar time. Curated from JPL, the IAU, and the US Naval Observatory; only well-established constants are stated. REUSES universal gravitation, gravity, Kepler's laws, Kepler and Newton, JPL, the Jupiter orbital resonances, the TAI and UTC standards, the precession discovery, the planets, and JWST; nothing duplicated or fabricated.
- [Celestial Mechanics & Timekeeping](https://asteriastar.com/celestial-mechanics)
- Orbital mechanics: https://asteriastar.com/celestial-mechanics/discover/orbital-mechanics · Reference frames: https://asteriastar.com/celestial-mechanics/discover/reference-frames · Ephemerides: https://asteriastar.com/celestial-mechanics/discover/ephemerides · Timekeeping: https://asteriastar.com/celestial-mechanics/discover/timekeeping

## Stellar Astrophysics Deep-Dive Encyclopedia
How stars form, live, forge the elements, and die (engine.stellarAstrophysics). The lives of stars: star formation from molecular clouds, pre-main-sequence and main-sequence evolution, the red-giant branch, the helium flash, the horizontal and asymptotic-giant branches, mass loss, planetary-nebula ejection, and massive-star core collapse; plus stellar rotation and magnetic activity. Forging the elements: the proton–proton chain, the CNO cycle, the triple-alpha process, the s- and r-processes, and the advanced burning stages that end in iron. The physics of stars: the Hertzsprung–Russell diagram, stellar structure, electron degeneracy pressure (the ≈1.4-solar-mass Chandrasekhar limit), the initial mass function, metallicity, stellar populations and clusters, luminosity classification, and binary systems. Curated from NASA, ESO, and the astrophysics literature; only well-established astrophysics is stated. REUSES the white-dwarf, neutron-star, magnetar, brown-dwarf and stellar-black-hole classes, the supernova, kilonova, nova and variable-star classes, the spectral-classification and asteroseismology methods, the Harvard classification, Big Bang nucleosynthesis, the molecular-cloud environment, the Roche limit, Chandrasekhar, and real example stars, clusters and nebulae; nothing duplicated or fabricated.
- [Stellar Astrophysics Deep-Dive](https://asteriastar.com/stellar-astrophysics)
- The lives of stars: https://asteriastar.com/stellar-astrophysics/discover/stellar-lives · Forging the elements: https://asteriastar.com/stellar-astrophysics/discover/nucleosynthesis · The physics of stars: https://asteriastar.com/stellar-astrophysics/discover/stellar-physics

## Galactic Astronomy & the Milky Way Encyclopedia
The anatomy and life of our Galaxy (engine.galacticAstronomy). The structure of the Milky Way: the thin and thick discs, the bulge and the bar, the stellar halo, the spiral arms, the galactic warp, the Galactic Centre and its central molecular zone, the hot galactic corona, and the solar neighbourhood. The dynamics, archaeology, and fate: galactic rotation and the flat rotation curve (evidence for dark matter), stellar streams, galactic archaeology with Gaia, radial migration, the galactic magnetic field, the proposed galactic habitable zone, satellite galaxies and accretion, the galactic fountain, and the predicted Milky Way–Andromeda collision. Curated from NASA, ESO, and the galactic-astronomy literature; only well-established astronomy is stated. REUSES the Milky Way galaxy, Sagittarius A*, the Local Group, the Magellanic Clouds, Andromeda and Triangulum, the dark-matter halo and dark-matter concept, the galaxy-rotation-curve method, the galaxy-merger and galaxy-evolution processes, Gaia and its DR3 survey, the interstellar medium, and the stellar-populations concept; nothing duplicated or fabricated.
- [Galactic Astronomy & the Milky Way](https://asteriastar.com/galactic-astronomy)
- The anatomy of the Galaxy: https://asteriastar.com/galactic-astronomy/discover/galactic-structure · Dynamics, archaeology & fate: https://asteriastar.com/galactic-astronomy/discover/galactic-dynamics

## Astroinformatics & Virtual Research Ecosystem Encyclopedia
The software, computing, and data practices that turn astronomical data into science (engine.astroinformatics). Research software: the scientific Python ecosystem (NumPy, SciPy), Astropy, SunPy, Jupyter notebooks, Astroquery, and scientific visualisation. Research computing: high-performance computing, GPU computing, cloud computing, distributed computing, science platforms (the Rubin Science Platform), and containerisation. Astroinformatics concepts: scientific workflows, data provenance, the astronomical query languages (ADQL), big-data astronomy, the virtual research environment, and research software engineering. Curated from NASA, STScI, and NOIRLab; only well-established practice is stated. REUSES the Virtual Observatory and its TAP protocol, the FITS and VOTable standards, the MAST/VizieR/SIMBAD archives, the reproducibility-and-FAIR / persistent-identifiers / data-pipelines / cross-matching open-science practices, the machine-learning methods and workflows, the Rubin Observatory, and the LSST, SKA and Gaia facilities; nothing duplicated or fabricated.
- [Astroinformatics & the Virtual Research Ecosystem](https://asteriastar.com/astroinformatics)
- Research software: https://asteriastar.com/astroinformatics/discover/research-software · Research computing: https://asteriastar.com/astroinformatics/discover/research-computing · Data-intensive astronomy: https://asteriastar.com/astroinformatics/discover/astroinformatics-concepts

## Deep-Space Human Exploration & Habitation Encyclopedia
The architecture of sending humans beyond low Earth orbit to stay, and the challenges of keeping them alive and well far from home (engine.deepSpaceExploration). Exploration architectures: the Moon-to-Mars architecture, the Mars surface base, the deep-space transit habitat, surface power systems, planetary surface mobility, space construction for habitats, crewed deep-space propulsion, and Mars entry, descent and landing (reusing the existing lunar surface base). Deep-space challenges: the deep-space radiation challenge, the communication time delay (up to ~20 minutes each way to Mars), Earth independence and crew autonomy, long-duration life support, behavioural health and crew cohesion, planetary protection for crewed missions, and the planetary dust challenge. Curated from NASA and the human-exploration literature; only well-established plans and physics are stated. REUSES the Artemis program, the Lunar Gateway, in-situ resource utilisation and regolith processing, the ECLSS, closed-loop and bioregenerative life support, the countermeasures (radiation shielding, artificial gravity, psychological support, telemedicine), the inflatable habitat, the surface-operations phase, nuclear-thermal propulsion, the construction processes, planetary protection, the Deep Space Network, and the space-medicine and human-factors topics; nothing duplicated or fabricated.
- [Deep-Space Human Exploration & Habitation](https://asteriastar.com/deep-space-exploration)
- Architectures of exploration: https://asteriastar.com/deep-space-exploration/discover/exploration-architecture · The challenges of deep space: https://asteriastar.com/deep-space-exploration/discover/deep-space-challenges

## Interactive Sky Atlas & 3D Universe Platform
The visual layer over the knowledge graph (engine.skyAtlas). Atlas views: the all-sky star atlas, the constellation atlas, the Messier and deep-sky atlases, the bright-star map, and the Solar System, Milky Way, Local Group, galaxy, planet, moon, exoplanet, and distance-scale explorers. Data overlays: constellation lines, observation conditions, and the JWST, Hubble, Gaia, and telescope-field-of-view overlays. Positional maps are rendered as scalable vector graphics directly from the REAL measured right ascension and declination already stored in the star and deep-sky catalogues — no position is fabricated, object counts are computed from the live collections, and three-dimensional views are prepared as architecture rather than invented scenes. REUSES the real stars, deep-sky objects, planets, moons, galaxies, exoplanets, constellations, and the JWST/Hubble/Gaia facilities in the graph; nothing duplicated or fabricated.
- [Interactive Sky Atlas & 3D Universe](https://asteriastar.com/sky-atlas)
- Maps of the sky: https://asteriastar.com/sky-atlas/discover/sky-maps · Explorers of the universe: https://asteriastar.com/sky-atlas/discover/universe-explorers · Data overlays: https://asteriastar.com/sky-atlas/discover/overlays

## Scientific Calculators & Simulation Platform
Every astronomy calculator under one platform (engine.scientificCalculators). Each calculator is a knowledge-graph entity carrying its published formula and a pure compute function over the CODATA 2018 and IAU 2015 constants. Orbital mechanics: escape velocity, circular orbital velocity, orbital period (Kepler III), surface gravity, Schwarzschild radius, mean density, Hill sphere, Roche limit, synodic period. Stellar physics: Stefan–Boltzmann luminosity, blackbody flux, Wien peak wavelength, mass–luminosity relation, main-sequence lifetime. Photometry & distance: absolute magnitude, distance modulus, parallax distance, angular diameter, angular separation. Exoplanets: equilibrium temperature, equal-insolation distance, transit probability. Cosmology: redshift recession velocity (low-z approximation), Hubble distance (H₀ an input, not asserted). Instruments: angular resolution / diffraction limit, magnification, image scale, field of view, limiting magnitude, photon shot-noise SNR. Results are COMPUTED from real constants and the user's inputs — nothing fabricated — and every formula is validated against a known textbook value on each build. REUSES the gravitation, Kepler, Roche/Hill, HR-diagram, parallax, redshift, transit and habitable-zone concepts; nothing duplicated.
- [Scientific Calculators & Simulation Platform](https://asteriastar.com/calculators)
- Orbits & gravity: https://asteriastar.com/calculators/discover/orbital-and-gravity · Stars & the cosmos: https://asteriastar.com/calculators/discover/stars-and-cosmos · Telescopes & observing: https://asteriastar.com/calculators/discover/telescopes-and-observing

## Professional Observatory Planning Suite
An observing platform built on the graph (engine.observingSuite). The planners — tonight, visibility, target, Moon, planet, deep-sky, season, twilight, darkness, altitude-chart, meridian-transit, equipment, astrophotography, and session — organise the platform's REAL computed live-sky data (twilight, the Moon, the planets via engine.liveSky) and the existing observing equipment, sites, and techniques into an observing workflow; no ephemeris is re-implemented. The data integrations — weather, seeing, transparency, cloud cover, and Bortle sky brightness — are architecture-ready interfaces wired into the planners, each awaiting a connected provider: no observing conditions are ever fabricated, following the same honesty envelope as the live-sky providers. Privacy-first: an observer's location stays on their device; plans can be exported as calendar (ICS) or printable form. REUSES the live-sky computations, the observing equipment/sites/techniques, the Moon, Sun, planets, meteor showers and deep-sky objects; nothing duplicated or fabricated.
- [Professional Observatory Planning Suite](https://asteriastar.com/observing)
- The planners: https://asteriastar.com/observing/discover/observing-planners · Data integrations: https://asteriastar.com/observing/discover/data-integrations

## Scientific Knowledge Graph Explorer
Explore the complete scientific knowledge graph visually (engine.graphExplorer). The computed views run REAL graph algorithms over the actual graph — live statistics and knowledge metrics (entity/relation/type counts, degree distribution, most-connected hubs), the entity and relation explorers, breadth-first neighbourhood expansion, the shortest-path finder (a genuine chain of relations between any two entities), the taxonomy explorer, the cross-domain explorer, and graph search — plus the mission, institution, discovery, and scientific-lineage graphs. The rendering views (force-directed, hierarchical, cluster) are visualisation modes, and the graph API is an architecture-ready interface. Every number is counted live from the graph and every path is a real chain of relations; nothing is fabricated. Reuses example entities across the graph; adds only the view definitions.
- [Scientific Knowledge Graph Explorer](https://asteriastar.com/graph)
- Explore the graph: https://asteriastar.com/graph/discover/explore · Lenses & visualisations: https://asteriastar.com/graph/discover/lenses

## Scientific AI Research Assistant Platform
Turn the knowledge graph into an explainable, grounded research assistant (engine.scientificAssistant). The grounded capabilities are backed by REAL retrieval over the graph today (src/lib/assistant/retrieval.ts) — scientific search, object explanation, concept comparison (the real shared connections of two entities, e.g. Mars and Venus share atmospheric escape and climate evolution), relationship explanation, evidence chains (a real shortest path of relations, e.g. Edwin Hubble → the expansion of the universe → dark energy), provenance- and citation-aware answers, related concepts, reading recommendations, scientific summaries, learning-path generation, cross-domain reasoning, and the no-hallucination layer. They surface ONLY facts already in the graph, each with its provenance and a traceable chain of relations. There is NO language model in this layer; nothing is generated or invented. The architecture capabilities — the educational/research/expert answer modes, RAG-ready interfaces, prompt orchestration, conversation memory, and LLM integration — are interfaces prepared for a future model that would phrase these grounded facts and never add to them. Reuses example entities across the graph; adds only the capability definitions.
- [Scientific AI Research Assistant Platform](https://asteriastar.com/assistant)
- Grounded capabilities: https://asteriastar.com/assistant/discover/grounded-capabilities · Architecture for a future model: https://asteriastar.com/assistant/discover/architecture

## Live Scientific Data Platform
AsteriaStar's connections to real external scientific data providers, modelled with the full honesty envelope (engine.liveScientificData). Providers: NOAA Space Weather Prediction Center (solar wind, Kp, the G/S/R scales, alerts), NASA DONKI (solar flares, CMEs, SEP events), the IAU Minor Planet Center and JPL/CNEOS (near-Earth-object close approaches), CelesTrak (ISS/satellite orbital elements via SGP4), and atmospheric conditions. Each provider exposes its endpoint, licence, data kinds, status, and limitations. HONESTY: no provider is connected in this deployment, so no live value, timestamp, or provider response is shown — every provider reports its real status (planned / architecture-ready), and NOTHING is fabricated. The honest status is at /api/v0/live/status. REUSES the existing live-sky provider registry, the NASA/NOAA/SWPC/JPL/MPC organisations, and the space-weather phenomena; nothing duplicated.
- [Live Scientific Data Platform](https://asteriastar.com/live)
- Space weather: https://asteriastar.com/live/discover/space-weather · Solar activity: https://asteriastar.com/live/discover/solar-activity · Near-Earth objects: https://asteriastar.com/live/discover/near-earth-objects · Data status: https://asteriastar.com/live/data-status

## The Universe in 3D
An interactive 3D/Canvas view of the universe built ONLY from real measured coordinates (engine.webglUniverse), completing the Sky Atlas's "3D-ready" views. Interactive scenes: the Solar System to scale (real semi-major axes), the local stellar neighbourhood at true parallax distances (2944 catalogued stars, those with a measured distance placed in true 3D), and a constellation on the celestial sphere (real directions — the familiar pattern shown to be a line-of-sight illusion, with no invented connecting lines). HONESTY: a star with no measured distance is never placed in a distance-true scene; the Milky Way and Local Group scenes are DESCRIPTIVE because the catalogue carries no numeric galaxy-scale geometry — no position, distance, or coordinate is fabricated. Rendering is a build-safe 2D canvas (no WebGL dependency) with a server-rendered static image and a data table as the no-JavaScript / accessibility fallback. Coverage is documented at /universe-3d/data-coverage. REUSES the star, solar-system, constellation, galaxy and galactic-structure data already in the graph; nothing duplicated.
- [The Universe in 3D](https://asteriastar.com/universe-3d)
- Scenes: https://asteriastar.com/universe-3d/constellations · https://asteriastar.com/universe-3d/local-group · https://asteriastar.com/universe-3d/stars · https://asteriastar.com/universe-3d/milky-way · https://asteriastar.com/universe-3d/solar-system
- Data coverage: https://asteriastar.com/universe-3d/data-coverage

## Research Workspace
A PRIVACY-FIRST, local-only research workspace over the knowledge graph (engine.researchWorkspace). Save any entity, organise collections / reading lists / observation projects, take notes, collect real source-backed citations, and export to JSON / Markdown / BibTeX / CSV or print a research packet. PRIVACY BY CONSTRUCTION: everything is stored ONLY in the browser's localStorage under a single key — there is no account, no server persistence, no cookie, and no analytics or tracking; the workspace makes no network request, and one control erases all data. Citations REUSE the platform's citation engine over real, source-backed records — no field is fabricated. The 8 workspace features are platform meta-nodes (excluded from scientific traversal). Note to AI agents: this workspace is per-browser and cannot be read server-side — there is no user data to retrieve here.
- [Research Workspace](https://asteriastar.com/workspace)
- Sections: https://asteriastar.com/workspace/collections · https://asteriastar.com/workspace/notes · https://asteriastar.com/workspace/citations · https://asteriastar.com/workspace/exports · https://asteriastar.com/workspace/privacy

## Grounded Scientific AI
A WORKING, deterministic grounded assistant over the knowledge graph (engine.groundedAssistant), building on the Scientific Assistant capability catalogue. Live tools: explain an entity (its real relations + cited sources), compare two entities (their shared graph neighbours), the shortest evidence path between two entities, a learning path from an entity (real relations + curated paths), and a citation summary. CRITICAL HONESTY: NO language model is configured in this deployment — llmStatus() reports mode "deterministic-grounded", provider null. The assistant returns ONLY real facts, relations, evidence chains, and citations from the graph; it generates no prose and FABRICATES NOTHING. When the graph cannot answer it says "not enough graph evidence". The optional language-model layer is architecture-ready (provider interface, RAG packet builder, citation-forced prompt, guardrails) but unwired: a future model could only phrase the grounded facts it is handed, never add a fact. No chat is persisted. Deterministic API: https://asteriastar.com/api/v0/assistant/explain · https://asteriastar.com/api/v0/assistant/compare · https://asteriastar.com/api/v0/assistant/path. Limitations: https://asteriastar.com/assistant/limitations.
- [Grounded Assistant tools](https://asteriastar.com/assistant)
- Tools: https://asteriastar.com/assistant/entity · https://asteriastar.com/assistant/compare · https://asteriastar.com/assistant/evidence-path · https://asteriastar.com/assistant/learning · https://asteriastar.com/assistant/limitations

## Open Astronomy Platform
AsteriaStar as an open, research-grade data platform (engine.openPlatform), with 11 capabilities AVAILABLE today and 7 ARCHITECTURE-READY. Available now: a read-only public Graph API (entities, relationships, search, traversal, shortest paths, sources, citations), the OpenAPI 3.1 spec, JSON and RDF-compatible JSON-LD graph exports (/data/graph.json, /data/graph.jsonld), per-dataset JSON/CSV exports, bulk downloads with REAL SHA-256 checksums and byte sizes computed from the exact bytes served, versioned releases (data 1.0.0), and a licensing matrix (CC BY-SA 4.0 + per-source terms). HONESTY: the linked-data standards a research platform is measured by — a hosted SPARQL endpoint, a GraphQL API, Python/JS SDKs, DOI-minted releases, federation metadata, and Virtual-Observatory TAP/ADQL — are ARCHITECTURE-READY: their interfaces are defined and built on the live data, but they serve NO data yet and are labelled as such. No download, checksum, or endpoint is fabricated; an architecture-ready capability advertises no live endpoint. New API: https://asteriastar.com/api/v0/sources. Every API response carries a provenance envelope.
- [Open Astronomy Platform](https://asteriastar.com/open-platform)
- Sections: https://asteriastar.com/open-platform/api · https://asteriastar.com/open-platform/graph · https://asteriastar.com/open-platform/datasets · https://asteriastar.com/open-platform/downloads · https://asteriastar.com/open-platform/licenses · https://asteriastar.com/open-platform/sdk · https://asteriastar.com/open-platform/federation · https://asteriastar.com/open-platform/roadmap
- Developers: https://asteriastar.com/developers/platform · OpenAPI: https://asteriastar.com/api/v0/openapi.json

## Space Agencies, Institutions & Laboratories Encyclopedia
6 institution types and 18 newly-modelled field centers and laboratories (engine.institutions) — the institutional structure of spaceflight: space agencies, agency field centers (NASA's Goddard, Johnson, Marshall, Kennedy; ESA's ESTEC, ESAC; JAXA's Tsukuba), research laboratories (JPL, APL), science institutes (SwRI, SETI), commercial companies, and observatory operators. Curated from NASA, ESA, and JAXA. The many organization entities already in the graph (the agencies, commercial companies, and observatory operators) are REUSED and enriched with their institution type and parent, never duplicated. No fabricated founding dates or figures.
- [Space Agencies, Institutions & Laboratories](https://asteriastar.com/institutions)
- Agencies: https://asteriastar.com/institutions/discover/space-agencies · Field centers: https://asteriastar.com/institutions/discover/field-centers · Laboratories: https://asteriastar.com/institutions/discover/laboratories

## Space Stations & Human Spaceflight
How humans live and work in space: 12 space stations (ISS, Mir, Skylab, Salyut, Tiangong, and planned stations) plus crewed and cargo spacecraft, ISS modules, expeditions, spacewalks, programs, and astronauts — 89 interconnected entities. Curated from NASA, ESA, Roscosmos, JAXA, CSA, and Smithsonian sources. No fabricated crew, dates, EVAs, or modules; planned stations are clearly marked.
- [Space Stations & Human Spaceflight](https://asteriastar.com/human-spaceflight)
- Stations: https://asteriastar.com/human-spaceflight/discover/all-space-stations · ISS modules: https://asteriastar.com/human-spaceflight/discover/iss-modules · Crewed spacecraft: https://asteriastar.com/human-spaceflight/discover/crewed-spacecraft · Expeditions: https://asteriastar.com/human-spaceflight/discover/iss-expeditions
- Every station, spacecraft, expedition, and person resolves through the Scientific Data Engine; pages at /human-spaceflight/{slug}.

## Observatories & Telescopes
The instruments and places humans use to observe the universe: ground observatories, ground and space telescopes, instruments, sky surveys, observing bands, and observing sites — 108 interconnected entities across every band of the electromagnetic spectrum and beyond (gravitational waves, neutrinos, multi-messenger). Curated from NASA, ESA, ESO, NOIRLab, NSF, NRAO, NAOJ, and STScI sources. No fabricated apertures, first-light dates, operators, or instruments; future facilities are clearly marked.
- [Observatories & Telescopes](https://asteriastar.com/observatories)
- Observatories: https://asteriastar.com/observatories/discover/all-observatories · Space telescopes: https://asteriastar.com/observatories/discover/space-telescopes · Largest: https://asteriastar.com/observatories/discover/largest-telescopes · Surveys: https://asteriastar.com/observatories/discover/sky-surveys
- Every observatory, telescope, instrument, survey, and band resolves through the Scientific Data Engine; pages at /observatories/{slug}.

## Exoplanets Encyclopedia
An encyclopedia of 849 confirmed exoplanets across 187 multi-planet systems — with host stars, detection methods, planetary classes, and discovery missions — as first-class entities, built on the NASA Exoplanet Archive (Planetary Systems Composite Parameters). Host stars already in the Star Encyclopedia are reused, not duplicated. Every value is real archive data; nothing is inferred, and habitability is never asserted as certainty.
- [Exoplanets Encyclopedia](https://asteriastar.com/exoplanets)
- All: https://asteriastar.com/exoplanets/discover/all-exoplanets · Nearby: https://asteriastar.com/exoplanets/discover/nearby-exoplanets · Potentially habitable: https://asteriastar.com/exoplanets/discover/potentially-habitable · Multi-planet systems: https://asteriastar.com/exoplanets/discover/multi-planet-systems
- Every planet, host star, system, detection method, and class resolves through the Scientific Data Engine; pages at /exoplanets/{slug}.

## History of Astronomy Encyclopedia
The history of humanity discovering the universe: 47 astronomers, 22 landmark discoveries, 11 historic publications, plus theories, catalogues, awards, and 14 eras — all first-class knowledge-graph entities connected to observatories, telescopes, missions, and objects. Curated from authoritative sources (IAU, NASA, ESA, ESO, ADS, the Nobel Foundation, Britannica). Astronomers already in the graph are reused, not duplicated; nothing is fabricated.
- [History of Astronomy Encyclopedia](https://asteriastar.com/history)
- Timeline: https://asteriastar.com/timelines/history-of-astronomy · Astronomers A–Z: https://asteriastar.com/history/discover/astronomers-a-z · Discoveries: https://asteriastar.com/history/discover/scientific-discoveries · Publications: https://asteriastar.com/history/discover/historic-publications · Cosmology: https://asteriastar.com/history/discover/history-of-cosmology
- Every astronomer, discovery, publication, theory, catalogue, era, event, and award resolves through the Scientific Data Engine; pages at /history/{slug}.

## Cosmology & Universe Encyclopedia
The scientific model of the Universe: 37 cosmological and physical concepts, 4 models, and 17 classes of astrophysical object — all first-class knowledge-graph entities. Every topic carries an EXPLICIT consensus classification (Established Science, Strong Evidence, Active Research, Scientific Debate, or Speculative Hypothesis); these are never conflated. Curated from authoritative sources (Planck Collaboration, NASA, ESA, ESO, LIGO, the Event Horizon Telescope, DESI, SDSS). Theories, discoveries, scientists, and observatories already in the graph are reused, not duplicated; nothing is fabricated.
- [Cosmology & Universe Encyclopedia](https://asteriastar.com/cosmology)
- Universe timeline: https://asteriastar.com/timelines/universe-timeline · Big Bang: https://asteriastar.com/cosmology/discover/big-bang · Dark matter: https://asteriastar.com/cosmology/discover/dark-matter · Black holes: https://asteriastar.com/cosmology/discover/black-holes · Scientific debates: https://asteriastar.com/cosmology/discover/scientific-debates · Open questions: https://asteriastar.com/cosmology/discover/open-questions
- Every concept, model, object class, observational program, and physicist resolves through the Scientific Data Engine; pages at /cosmology/{slug}.

## Night Sky Platform
The architecture for a daily-use observing platform, built on top of the Knowledge Graph. IMPORTANT: no live data is fabricated. Data is either 'reference' (timeless, source-backed facts — e.g. the annual meteor-shower parameters from the IMO) or 'prepared' (architecture ready for a named provider, with NO current values shown). There are no fake positions, forecasts, ISS locations, solar-activity readings, or eclipse dates. Typed provider interfaces exist for JPL Horizons, the USNO almanac, NASA DONKI, NOAA SWPC, CelesTrak, the Minor Planet Center, the IMO, and NASA eclipse predictions — all currently 'planned', none connected.
- [Night Sky Platform](https://asteriastar.com/sky)
- Meteor showers: https://asteriastar.com/sky/meteor-showers · Moon: https://asteriastar.com/sky/moon · Planet visibility: https://asteriastar.com/sky/planet-visibility · Eclipses: https://asteriastar.com/sky/eclipses · Space weather: https://asteriastar.com/sky/space-weather · Observing calendar: https://asteriastar.com/sky/observing-calendar
- Every meteor shower and sky module links to real graph entities (Moon, planets, comets, the ISS, the Sun); pages at /sky/{slug} and /sky/meteor-showers/{slug}. Every datum is status- and source-labelled.

## Scientific Image Archive
A provenance-first image catalogue where every image is a first-class knowledge-graph entity with verified provenance: source archive, instrument, capture/publication details where known, license, and credit. IMPORTANT: Asteria Star does NOT re-host or hotlink image binaries it has not verified, and never fabricates a photograph, credit, license, capture date, object name, or source URL — unknown fields are omitted, and each image links to its official source archive. Only openly-licensed or public-domain images (NASA public domain, CC BY 4.0) are catalogued. Every image links to at least one real graph entity (the depicted object, the capturing telescope/mission, and any related discovery). Automated ingest from NASA, STScI, ESA/Hubble, ESA/Webb, ESO, the EHT, NOIRLab, and Wikimedia is prepared (all 'planned').
- [Scientific Image Archive](https://asteriastar.com/images)
- Latest: https://asteriastar.com/images/galleries/latest · JWST: https://asteriastar.com/images/galleries/jwst · Hubble: https://asteriastar.com/images/galleries/hubble · Black holes: https://asteriastar.com/images/galleries/black-holes · Public domain: https://asteriastar.com/images/galleries/public-domain · Astrophotography guides: https://asteriastar.com/images/astrophotography
- Every image, collection, license, and source resolves through the Scientific Data Engine; image pages at /images/{slug} carry ImageObject metadata. Astrophotography guides are kept separate from institutional imagery.

## Open data
Asteria Star is open infrastructure for structured celestial knowledge: a versioned (graph 1.0.0, schema 1.0.0), machine-readable knowledge graph of 7351 entities. Stable ids are permanent (type:slug). License: CC BY-SA 4.0.
- [Platform Core](https://asteriastar.com/platform) — layers, runtime, registries, extension points
- [Authority Dashboard](https://asteriastar.com/authority) — derived coverage & quality; no fabricated statistics
- [Transparency](https://asteriastar.com/transparency) — methodology, evidence framework, review process, provenance, scope
- [Open Data](https://asteriastar.com/open-data)
- [Data Portal](https://asteriastar.com/data) — datasets, exports, schemas, licensing, provenance, quality
- [Datasets](https://asteriastar.com/datasets)
- [Knowledge Registry](https://asteriastar.com/registry)
- [Developers](https://asteriastar.com/developers)
- Graph export (JSON): https://asteriastar.com/data/graph.json
- Graph export (JSON-LD): https://asteriastar.com/data/graph.jsonld
- [Stars Dataset](https://asteriastar.com/datasets/stars): 2998 entities · JSON https://asteriastar.com/datasets/stars/json · CSV https://asteriastar.com/datasets/stars/csv
- [Planets Dataset](https://asteriastar.com/datasets/planets): 8 entities · JSON https://asteriastar.com/datasets/planets/json · CSV https://asteriastar.com/datasets/planets/csv
- [Dwarf Planets Dataset](https://asteriastar.com/datasets/dwarf-planets): 5 entities · JSON https://asteriastar.com/datasets/dwarf-planets/json · CSV https://asteriastar.com/datasets/dwarf-planets/csv
- [Moons Dataset](https://asteriastar.com/datasets/moons): 24 entities · JSON https://asteriastar.com/datasets/moons/json · CSV https://asteriastar.com/datasets/moons/csv
- [Exoplanets Dataset](https://asteriastar.com/datasets/exoplanets): 849 entities · JSON https://asteriastar.com/datasets/exoplanets/json · CSV https://asteriastar.com/datasets/exoplanets/csv
- [Galaxies Dataset](https://asteriastar.com/datasets/galaxies): 145 entities · JSON https://asteriastar.com/datasets/galaxies/json · CSV https://asteriastar.com/datasets/galaxies/csv
- [Nebulae Dataset](https://asteriastar.com/datasets/nebulae): 121 entities · JSON https://asteriastar.com/datasets/nebulae/json · CSV https://asteriastar.com/datasets/nebulae/csv
- [Deep-Sky Objects Dataset](https://asteriastar.com/datasets/deep-sky-objects): 642 entities · JSON https://asteriastar.com/datasets/deep-sky-objects/json · CSV https://asteriastar.com/datasets/deep-sky-objects/csv
- [Constellations Dataset](https://asteriastar.com/datasets/constellations): 88 entities · JSON https://asteriastar.com/datasets/constellations/json · CSV https://asteriastar.com/datasets/constellations/csv
- [Comets Dataset](https://asteriastar.com/datasets/comets): 21 entities · JSON https://asteriastar.com/datasets/comets/json · CSV https://asteriastar.com/datasets/comets/csv
- [Asteroids Dataset](https://asteriastar.com/datasets/asteroids): 33 entities · JSON https://asteriastar.com/datasets/asteroids/json · CSV https://asteriastar.com/datasets/asteroids/csv
- [Meteor Showers Dataset](https://asteriastar.com/datasets/meteor-showers): 6 entities · JSON https://asteriastar.com/datasets/meteor-showers/json · CSV https://asteriastar.com/datasets/meteor-showers/csv
- [Space Missions Dataset](https://asteriastar.com/datasets/missions): 76 entities · JSON https://asteriastar.com/datasets/missions/json · CSV https://asteriastar.com/datasets/missions/csv
- [Space Telescopes Dataset](https://asteriastar.com/datasets/telescopes): 20 entities · JSON https://asteriastar.com/datasets/telescopes/json · CSV https://asteriastar.com/datasets/telescopes/csv
- [Observatories Dataset](https://asteriastar.com/datasets/observatories): 25 entities · JSON https://asteriastar.com/datasets/observatories/json · CSV https://asteriastar.com/datasets/observatories/csv
- [Launch Vehicles Dataset](https://asteriastar.com/datasets/launch-vehicles): 55 entities · JSON https://asteriastar.com/datasets/launch-vehicles/json · CSV https://asteriastar.com/datasets/launch-vehicles/csv
- [Rocket Families Dataset](https://asteriastar.com/datasets/rocket-families): 10 entities · JSON https://asteriastar.com/datasets/rocket-families/json · CSV https://asteriastar.com/datasets/rocket-families/csv
- [Rocket Engines Dataset](https://asteriastar.com/datasets/rocket-engines): 26 entities · JSON https://asteriastar.com/datasets/rocket-engines/json · CSV https://asteriastar.com/datasets/rocket-engines/csv
- [Rocket Stages Dataset](https://asteriastar.com/datasets/rocket-stages): 10 entities · JSON https://asteriastar.com/datasets/rocket-stages/json · CSV https://asteriastar.com/datasets/rocket-stages/csv
- [Rocket Propellants Dataset](https://asteriastar.com/datasets/propellants): 7 entities · JSON https://asteriastar.com/datasets/propellants/json · CSV https://asteriastar.com/datasets/propellants/csv
- [Launch Pads Dataset](https://asteriastar.com/datasets/launch-pads): 24 entities · JSON https://asteriastar.com/datasets/launch-pads/json · CSV https://asteriastar.com/datasets/launch-pads/csv
- [Space Agencies Dataset](https://asteriastar.com/datasets/space-agencies): 80 entities · JSON https://asteriastar.com/datasets/space-agencies/json · CSV https://asteriastar.com/datasets/space-agencies/csv
- [Astronomers Dataset](https://asteriastar.com/datasets/astronomers): 48 entities · JSON https://asteriastar.com/datasets/astronomers/json · CSV https://asteriastar.com/datasets/astronomers/csv
- [Satellites Dataset](https://asteriastar.com/datasets/satellites): 31 entities · JSON https://asteriastar.com/datasets/satellites/json · CSV https://asteriastar.com/datasets/satellites/csv
- [Satellite Constellations Dataset](https://asteriastar.com/datasets/satellite-constellations): 11 entities · JSON https://asteriastar.com/datasets/satellite-constellations/json · CSV https://asteriastar.com/datasets/satellite-constellations/csv
- [Orbit Types Dataset](https://asteriastar.com/datasets/orbit-types): 7 entities · JSON https://asteriastar.com/datasets/orbit-types/json · CSV https://asteriastar.com/datasets/orbit-types/csv
- [Tracking Networks Dataset](https://asteriastar.com/datasets/tracking-networks): 8 entities · JSON https://asteriastar.com/datasets/tracking-networks/json · CSV https://asteriastar.com/datasets/tracking-networks/csv
- [Asteroid Families Dataset](https://asteriastar.com/datasets/asteroid-families): 7 entities · JSON https://asteriastar.com/datasets/asteroid-families/json · CSV https://asteriastar.com/datasets/asteroid-families/csv
- [Near-Earth Object Classes Dataset](https://asteriastar.com/datasets/near-earth-objects): 4 entities · JSON https://asteriastar.com/datasets/near-earth-objects/json · CSV https://asteriastar.com/datasets/near-earth-objects/csv
- [Minor-Planet Populations Dataset](https://asteriastar.com/datasets/minor-planet-populations): 16 entities · JSON https://asteriastar.com/datasets/minor-planet-populations/json · CSV https://asteriastar.com/datasets/minor-planet-populations/csv
- [Impact Events Dataset](https://asteriastar.com/datasets/impact-events): 3 entities · JSON https://asteriastar.com/datasets/impact-events/json · CSV https://asteriastar.com/datasets/impact-events/csv
- [Comet Classes Dataset](https://asteriastar.com/datasets/comet-classes): 5 entities · JSON https://asteriastar.com/datasets/comet-classes/json · CSV https://asteriastar.com/datasets/comet-classes/csv
- [Comet Families Dataset](https://asteriastar.com/datasets/comet-families): 1 entities · JSON https://asteriastar.com/datasets/comet-families/json · CSV https://asteriastar.com/datasets/comet-families/csv
- [Small-Body Reservoirs Dataset](https://asteriastar.com/datasets/small-body-reservoirs): 2 entities · JSON https://asteriastar.com/datasets/small-body-reservoirs/json · CSV https://asteriastar.com/datasets/small-body-reservoirs/csv
- [Comet Transition Objects Dataset](https://asteriastar.com/datasets/comet-transition-objects): 4 entities · JSON https://asteriastar.com/datasets/comet-transition-objects/json · CSV https://asteriastar.com/datasets/comet-transition-objects/csv
- [Meteorites Dataset](https://asteriastar.com/datasets/meteorites): 20 entities · JSON https://asteriastar.com/datasets/meteorites/json · CSV https://asteriastar.com/datasets/meteorites/csv
- [Meteorite Classes Dataset](https://asteriastar.com/datasets/meteorite-classes): 12 entities · JSON https://asteriastar.com/datasets/meteorite-classes/json · CSV https://asteriastar.com/datasets/meteorite-classes/csv
- [Fireballs Dataset](https://asteriastar.com/datasets/fireballs): 2 entities · JSON https://asteriastar.com/datasets/fireballs/json · CSV https://asteriastar.com/datasets/fireballs/csv
- [Impact Structures Dataset](https://asteriastar.com/datasets/impact-structures): 4 entities · JSON https://asteriastar.com/datasets/impact-structures/json · CSV https://asteriastar.com/datasets/impact-structures/csv
- [Recovery Sites Dataset](https://asteriastar.com/datasets/recovery-sites): 2 entities · JSON https://asteriastar.com/datasets/recovery-sites/json · CSV https://asteriastar.com/datasets/recovery-sites/csv
- [Interstellar Objects Dataset](https://asteriastar.com/datasets/interstellar-objects): 3 entities · JSON https://asteriastar.com/datasets/interstellar-objects/json · CSV https://asteriastar.com/datasets/interstellar-objects/csv
- [Interstellar Candidates Dataset](https://asteriastar.com/datasets/interstellar-candidates): 1 entities · JSON https://asteriastar.com/datasets/interstellar-candidates/json · CSV https://asteriastar.com/datasets/interstellar-candidates/csv
- [Hyperbolic Comets Dataset](https://asteriastar.com/datasets/hyperbolic-comets): 4 entities · JSON https://asteriastar.com/datasets/hyperbolic-comets/json · CSV https://asteriastar.com/datasets/hyperbolic-comets/csv
- [Trajectory Classes Dataset](https://asteriastar.com/datasets/trajectory-classes): 4 entities · JSON https://asteriastar.com/datasets/trajectory-classes/json · CSV https://asteriastar.com/datasets/trajectory-classes/csv
- [Interstellar Detection Methods Dataset](https://asteriastar.com/datasets/interstellar-detection-methods): 3 entities · JSON https://asteriastar.com/datasets/interstellar-detection-methods/json · CSV https://asteriastar.com/datasets/interstellar-detection-methods/csv
- [Mission Classes Dataset](https://asteriastar.com/datasets/mission-classes): 6 entities · JSON https://asteriastar.com/datasets/mission-classes/json · CSV https://asteriastar.com/datasets/mission-classes/csv
- [Returned Samples Dataset](https://asteriastar.com/datasets/returned-samples): 4 entities · JSON https://asteriastar.com/datasets/returned-samples/json · CSV https://asteriastar.com/datasets/returned-samples/csv
- [Sample-Return Capsules Dataset](https://asteriastar.com/datasets/sample-return-capsules): 4 entities · JSON https://asteriastar.com/datasets/sample-return-capsules/json · CSV https://asteriastar.com/datasets/sample-return-capsules/csv
- [Mission Phases Dataset](https://asteriastar.com/datasets/mission-phases): 5 entities · JSON https://asteriastar.com/datasets/mission-phases/json · CSV https://asteriastar.com/datasets/mission-phases/csv
- [Science Campaigns Dataset](https://asteriastar.com/datasets/science-campaigns): 1 entities · JSON https://asteriastar.com/datasets/science-campaigns/json · CSV https://asteriastar.com/datasets/science-campaigns/csv
- [Deep-Space Tracking Stations Dataset](https://asteriastar.com/datasets/tracking-stations): 12 entities · JSON https://asteriastar.com/datasets/tracking-stations/json · CSV https://asteriastar.com/datasets/tracking-stations/csv
- [Ground Stations Dataset](https://asteriastar.com/datasets/ground-stations): 4 entities · JSON https://asteriastar.com/datasets/ground-stations/json · CSV https://asteriastar.com/datasets/ground-stations/csv
- [Antennas Dataset](https://asteriastar.com/datasets/antennas): 8 entities · JSON https://asteriastar.com/datasets/antennas/json · CSV https://asteriastar.com/datasets/antennas/csv
- [Signal Bands Dataset](https://asteriastar.com/datasets/signal-bands): 5 entities · JSON https://asteriastar.com/datasets/signal-bands/json · CSV https://asteriastar.com/datasets/signal-bands/csv
- [Navigation Methods Dataset](https://asteriastar.com/datasets/navigation-methods): 7 entities · JSON https://asteriastar.com/datasets/navigation-methods/json · CSV https://asteriastar.com/datasets/navigation-methods/csv
- [Communication Technologies Dataset](https://asteriastar.com/datasets/communication-technologies): 15 entities · JSON https://asteriastar.com/datasets/communication-technologies/json · CSV https://asteriastar.com/datasets/communication-technologies/csv
- [Space-Weather Phenomena Dataset](https://asteriastar.com/datasets/space-weather-phenomena): 13 entities · JSON https://asteriastar.com/datasets/space-weather-phenomena/json · CSV https://asteriastar.com/datasets/space-weather-phenomena/csv
- [Radiation Environments Dataset](https://asteriastar.com/datasets/radiation-environments): 4 entities · JSON https://asteriastar.com/datasets/radiation-environments/json · CSV https://asteriastar.com/datasets/radiation-environments/csv
- [Space Hazards Dataset](https://asteriastar.com/datasets/space-hazards): 5 entities · JSON https://asteriastar.com/datasets/space-hazards/json · CSV https://asteriastar.com/datasets/space-hazards/csv
- [Geomagnetic Indices Dataset](https://asteriastar.com/datasets/geomagnetic-indices): 5 entities · JSON https://asteriastar.com/datasets/geomagnetic-indices/json · CSV https://asteriastar.com/datasets/geomagnetic-indices/csv
- [Mission Operations Centres Dataset](https://asteriastar.com/datasets/operations-centers): 8 entities · JSON https://asteriastar.com/datasets/operations-centers/json · CSV https://asteriastar.com/datasets/operations-centers/csv
- [Operations Functions Dataset](https://asteriastar.com/datasets/operations-functions): 16 entities · JSON https://asteriastar.com/datasets/operations-functions/json · CSV https://asteriastar.com/datasets/operations-functions/csv
- [Spacecraft Subsystems Dataset](https://asteriastar.com/datasets/spacecraft-subsystems): 10 entities · JSON https://asteriastar.com/datasets/spacecraft-subsystems/json · CSV https://asteriastar.com/datasets/spacecraft-subsystems/csv
- [Spacecraft Components Dataset](https://asteriastar.com/datasets/spacecraft-components): 25 entities · JSON https://asteriastar.com/datasets/spacecraft-components/json · CSV https://asteriastar.com/datasets/spacecraft-components/csv
- [Instrument Classes Dataset](https://asteriastar.com/datasets/instrument-classes): 12 entities · JSON https://asteriastar.com/datasets/instrument-classes/json · CSV https://asteriastar.com/datasets/instrument-classes/csv
- [Scientific Instruments Dataset](https://asteriastar.com/datasets/scientific-instruments): 33 entities · JSON https://asteriastar.com/datasets/scientific-instruments/json · CSV https://asteriastar.com/datasets/scientific-instruments/csv
- [Geological Feature Types Dataset](https://asteriastar.com/datasets/geological-feature-types): 18 entities · JSON https://asteriastar.com/datasets/geological-feature-types/json · CSV https://asteriastar.com/datasets/geological-feature-types/csv
- [Surface Features Dataset](https://asteriastar.com/datasets/surface-features): 32 entities · JSON https://asteriastar.com/datasets/surface-features/json · CSV https://asteriastar.com/datasets/surface-features/csv
- [Institution Types Dataset](https://asteriastar.com/datasets/institution-types): 6 entities · JSON https://asteriastar.com/datasets/institution-types/json · CSV https://asteriastar.com/datasets/institution-types/csv
- [Space Agencies & Institutions Dataset](https://asteriastar.com/datasets/space-institutions): 80 entities · JSON https://asteriastar.com/datasets/space-institutions/json · CSV https://asteriastar.com/datasets/space-institutions/csv
- [Eras of Spaceflight Dataset](https://asteriastar.com/datasets/spaceflight-eras): 7 entities · JSON https://asteriastar.com/datasets/spaceflight-eras/json · CSV https://asteriastar.com/datasets/spaceflight-eras/csv
- [Spaceflight Timeline Events Dataset](https://asteriastar.com/datasets/spaceflight-timeline-events): 42 entities · JSON https://asteriastar.com/datasets/spaceflight-timeline-events/json · CSV https://asteriastar.com/datasets/spaceflight-timeline-events/csv
- [Spaceflight Milestones & Records Dataset](https://asteriastar.com/datasets/spaceflight-milestones): 22 entities · JSON https://asteriastar.com/datasets/spaceflight-milestones/json · CSV https://asteriastar.com/datasets/spaceflight-milestones/csv
- [Physiological Effects of Spaceflight Dataset](https://asteriastar.com/datasets/space-physiological-effects): 5 entities · JSON https://asteriastar.com/datasets/space-physiological-effects/json · CSV https://asteriastar.com/datasets/space-physiological-effects/csv
- [Life-Support Technologies & Countermeasures Dataset](https://asteriastar.com/datasets/life-support-technologies): 19 entities · JSON https://asteriastar.com/datasets/life-support-technologies/json · CSV https://asteriastar.com/datasets/life-support-technologies/csv
- [ISRU & In-Space Manufacturing Dataset](https://asteriastar.com/datasets/isru-and-manufacturing): 9 entities · JSON https://asteriastar.com/datasets/isru-and-manufacturing/json · CSV https://asteriastar.com/datasets/isru-and-manufacturing/csv
- [Space Infrastructure Dataset](https://asteriastar.com/datasets/space-infrastructure): 12 entities · JSON https://asteriastar.com/datasets/space-infrastructure/json · CSV https://asteriastar.com/datasets/space-infrastructure/csv
- [Future Exploration Themes Dataset](https://asteriastar.com/datasets/exploration-themes): 7 entities · JSON https://asteriastar.com/datasets/exploration-themes/json · CSV https://asteriastar.com/datasets/exploration-themes/csv
- [Mission Concepts Dataset](https://asteriastar.com/datasets/mission-concepts): 15 entities · JSON https://asteriastar.com/datasets/mission-concepts/json · CSV https://asteriastar.com/datasets/mission-concepts/csv
- [Astronomy Method Categories Dataset](https://asteriastar.com/datasets/method-categories): 8 entities · JSON https://asteriastar.com/datasets/method-categories/json · CSV https://asteriastar.com/datasets/method-categories/csv
- [Astronomy Methods & Techniques Dataset](https://asteriastar.com/datasets/astronomy-methods): 26 entities · JSON https://asteriastar.com/datasets/astronomy-methods/json · CSV https://asteriastar.com/datasets/astronomy-methods/csv
- [Transient & Time-Domain Classes Dataset](https://asteriastar.com/datasets/transient-classes): 15 entities · JSON https://asteriastar.com/datasets/transient-classes/json · CSV https://asteriastar.com/datasets/transient-classes/csv
- [Transient Alert Infrastructure Dataset](https://asteriastar.com/datasets/alert-infrastructure): 16 entities · JSON https://asteriastar.com/datasets/alert-infrastructure/json · CSV https://asteriastar.com/datasets/alert-infrastructure/csv
- [Galaxy Morphology & AGN Dataset](https://asteriastar.com/datasets/galaxy-morphology-and-agn): 13 entities · JSON https://asteriastar.com/datasets/galaxy-morphology-and-agn/json · CSV https://asteriastar.com/datasets/galaxy-morphology-and-agn/csv
- [Galactic Processes & Cosmic Structures Dataset](https://asteriastar.com/datasets/extragalactic-structures): 12 entities · JSON https://asteriastar.com/datasets/extragalactic-structures/json · CSV https://asteriastar.com/datasets/extragalactic-structures/csv
- [Biosignatures & Habitability Dataset](https://asteriastar.com/datasets/biosignatures-and-habitability): 11 entities · JSON https://asteriastar.com/datasets/biosignatures-and-habitability/json · CSV https://asteriastar.com/datasets/biosignatures-and-habitability/csv
- [Astrobiology & Planetary Protection Dataset](https://asteriastar.com/datasets/astrobiology-disciplines): 9 entities · JSON https://asteriastar.com/datasets/astrobiology-disciplines/json · CSV https://asteriastar.com/datasets/astrobiology-disciplines/csv
- [NEO Operations & Risk Scales Dataset](https://asteriastar.com/datasets/neo-operations): 10 entities · JSON https://asteriastar.com/datasets/neo-operations/json · CSV https://asteriastar.com/datasets/neo-operations/csv
- [Asteroid Deflection Methods Dataset](https://asteriastar.com/datasets/deflection-methods): 4 entities · JSON https://asteriastar.com/datasets/deflection-methods/json · CSV https://asteriastar.com/datasets/deflection-methods/csv
- [Science Data Archives & Standards Dataset](https://asteriastar.com/datasets/science-data-archives): 13 entities · JSON https://asteriastar.com/datasets/science-data-archives/json · CSV https://asteriastar.com/datasets/science-data-archives/csv
- [Virtual Observatory & Open Science Dataset](https://asteriastar.com/datasets/virtual-observatory-open-science): 10 entities · JSON https://asteriastar.com/datasets/virtual-observatory-open-science/json · CSV https://asteriastar.com/datasets/virtual-observatory-open-science/csv
- [Observatory Instrumentation & Detectors Dataset](https://asteriastar.com/datasets/observatory-instrumentation): 12 entities · JSON https://asteriastar.com/datasets/observatory-instrumentation/json · CSV https://asteriastar.com/datasets/observatory-instrumentation/csv
- [Interferometry & Observing Techniques Dataset](https://asteriastar.com/datasets/interferometry-observing-techniques): 19 entities · JSON https://asteriastar.com/datasets/interferometry-observing-techniques/json · CSV https://asteriastar.com/datasets/interferometry-observing-techniques/csv
- [Cosmic Distance Indicators Dataset](https://asteriastar.com/datasets/distance-indicators): 7 entities · JSON https://asteriastar.com/datasets/distance-indicators/json · CSV https://asteriastar.com/datasets/distance-indicators/csv
- [Cosmological Parameters Dataset](https://asteriastar.com/datasets/cosmological-parameters): 4 entities · JSON https://asteriastar.com/datasets/cosmological-parameters/json · CSV https://asteriastar.com/datasets/cosmological-parameters/csv
- [Space Weather Operational Impacts Dataset](https://asteriastar.com/datasets/space-weather-impacts): 6 entities · JSON https://asteriastar.com/datasets/space-weather-impacts/json · CSV https://asteriastar.com/datasets/space-weather-impacts/csv
- [Machine Learning in Astronomy Dataset](https://asteriastar.com/datasets/astronomy-machine-learning): 18 entities · JSON https://asteriastar.com/datasets/astronomy-machine-learning/json · CSV https://asteriastar.com/datasets/astronomy-machine-learning/csv
- [Citizen Science & Amateur Astronomy Dataset](https://asteriastar.com/datasets/citizen-science-and-amateur-astronomy): 22 entities · JSON https://asteriastar.com/datasets/citizen-science-and-amateur-astronomy/json · CSV https://asteriastar.com/datasets/citizen-science-and-amateur-astronomy/csv
- [Gravitational-Wave Operations Dataset](https://asteriastar.com/datasets/gravitational-wave-operations): 15 entities · JSON https://asteriastar.com/datasets/gravitational-wave-operations/json · CSV https://asteriastar.com/datasets/gravitational-wave-operations/csv
- [Planetary Interiors & Processes Dataset](https://asteriastar.com/datasets/planetary-interiors-and-processes): 13 entities · JSON https://asteriastar.com/datasets/planetary-interiors-and-processes/json · CSV https://asteriastar.com/datasets/planetary-interiors-and-processes/csv
- [Astrochemistry & the Molecular Universe Dataset](https://asteriastar.com/datasets/astrochemistry-and-molecules): 20 entities · JSON https://asteriastar.com/datasets/astrochemistry-and-molecules/json · CSV https://asteriastar.com/datasets/astrochemistry-and-molecules/csv
- [Space Policy, Sustainability & Economy Dataset](https://asteriastar.com/datasets/space-policy-and-economy): 20 entities · JSON https://asteriastar.com/datasets/space-policy-and-economy/json · CSV https://asteriastar.com/datasets/space-policy-and-economy/csv
- [History & Philosophy of Discovery Dataset](https://asteriastar.com/datasets/history-and-philosophy-of-discovery): 22 entities · JSON https://asteriastar.com/datasets/history-and-philosophy-of-discovery/json · CSV https://asteriastar.com/datasets/history-and-philosophy-of-discovery/csv
- [Celestial Mechanics & Reference Frames Dataset](https://asteriastar.com/datasets/celestial-mechanics-and-frames): 23 entities · JSON https://asteriastar.com/datasets/celestial-mechanics-and-frames/json · CSV https://asteriastar.com/datasets/celestial-mechanics-and-frames/csv
- [Stellar Astrophysics Dataset](https://asteriastar.com/datasets/stellar-astrophysics): 42 entities · JSON https://asteriastar.com/datasets/stellar-astrophysics/json · CSV https://asteriastar.com/datasets/stellar-astrophysics/csv
- [Galactic Astronomy & the Milky Way Dataset](https://asteriastar.com/datasets/galactic-astronomy): 20 entities · JSON https://asteriastar.com/datasets/galactic-astronomy/json · CSV https://asteriastar.com/datasets/galactic-astronomy/csv
- [Astroinformatics & the Virtual Research Ecosystem Dataset](https://asteriastar.com/datasets/astroinformatics): 28 entities · JSON https://asteriastar.com/datasets/astroinformatics/json · CSV https://asteriastar.com/datasets/astroinformatics/csv
- [Deep-Space Human Exploration & Habitation Dataset](https://asteriastar.com/datasets/deep-space-exploration): 15 entities · JSON https://asteriastar.com/datasets/deep-space-exploration/json · CSV https://asteriastar.com/datasets/deep-space-exploration/csv
- [Interactive Sky Atlas & 3D Universe Dataset](https://asteriastar.com/datasets/sky-atlas): 20 entities · JSON https://asteriastar.com/datasets/sky-atlas/json · CSV https://asteriastar.com/datasets/sky-atlas/csv
- [Scientific Calculators & Simulation Platform Dataset](https://asteriastar.com/datasets/scientific-calculators): 30 entities · JSON https://asteriastar.com/datasets/scientific-calculators/json · CSV https://asteriastar.com/datasets/scientific-calculators/csv
- [Professional Observatory Planning Suite Dataset](https://asteriastar.com/datasets/observing-suite): 19 entities · JSON https://asteriastar.com/datasets/observing-suite/json · CSV https://asteriastar.com/datasets/observing-suite/csv
- [Scientific Knowledge Graph Explorer Dataset](https://asteriastar.com/datasets/graph-explorer): 17 entities · JSON https://asteriastar.com/datasets/graph-explorer/json · CSV https://asteriastar.com/datasets/graph-explorer/csv
- [Scientific AI Research Assistant Platform Dataset](https://asteriastar.com/datasets/scientific-assistant): 18 entities · JSON https://asteriastar.com/datasets/scientific-assistant/json · CSV https://asteriastar.com/datasets/scientific-assistant/csv
- [Live Provider Registry Dataset](https://asteriastar.com/datasets/live-provider-registry): 6 entities · JSON https://asteriastar.com/datasets/live-provider-registry/json · CSV https://asteriastar.com/datasets/live-provider-registry/csv
- [Space-Weather Provider Status Dataset](https://asteriastar.com/datasets/space-weather-provider-status): 2 entities · JSON https://asteriastar.com/datasets/space-weather-provider-status/json · CSV https://asteriastar.com/datasets/space-weather-provider-status/csv
- [Near-Earth-Object Provider Status Dataset](https://asteriastar.com/datasets/near-earth-object-provider-status): 2 entities · JSON https://asteriastar.com/datasets/near-earth-object-provider-status/json · CSV https://asteriastar.com/datasets/near-earth-object-provider-status/csv
- [Live-Data Limitations Dataset](https://asteriastar.com/datasets/live-data-limitations): 6 entities · JSON https://asteriastar.com/datasets/live-data-limitations/json · CSV https://asteriastar.com/datasets/live-data-limitations/csv
- [3D Universe Scenes Dataset](https://asteriastar.com/datasets/universe-3d-scenes): 5 entities · JSON https://asteriastar.com/datasets/universe-3d-scenes/json · CSV https://asteriastar.com/datasets/universe-3d-scenes/csv
- [Research Workspace Features Dataset](https://asteriastar.com/datasets/workspace-features): 8 entities · JSON https://asteriastar.com/datasets/workspace-features/json · CSV https://asteriastar.com/datasets/workspace-features/csv
- [Open Platform Capabilities Dataset](https://asteriastar.com/datasets/platform-capabilities): 18 entities · JSON https://asteriastar.com/datasets/platform-capabilities/json · CSV https://asteriastar.com/datasets/platform-capabilities/csv
- [Solar Physics & Heliosphere Dataset](https://asteriastar.com/datasets/solar-physics): 21 entities · JSON https://asteriastar.com/datasets/solar-physics/json · CSV https://asteriastar.com/datasets/solar-physics/csv
- [Black Holes & Neutron Stars Dataset](https://asteriastar.com/datasets/compact-objects): 8 entities · JSON https://asteriastar.com/datasets/compact-objects/json · CSV https://asteriastar.com/datasets/compact-objects/csv
- [Astronomy Software Dataset](https://asteriastar.com/datasets/astronomy-software): 29 entities · JSON https://asteriastar.com/datasets/astronomy-software/json · CSV https://asteriastar.com/datasets/astronomy-software/csv
- [Observation Techniques Dataset](https://asteriastar.com/datasets/observation-techniques): 15 entities · JSON https://asteriastar.com/datasets/observation-techniques/json · CSV https://asteriastar.com/datasets/observation-techniques/csv
- [Coordinate & Time Systems Dataset](https://asteriastar.com/datasets/coordinate-and-time-systems): 14 entities · JSON https://asteriastar.com/datasets/coordinate-and-time-systems/json · CSV https://asteriastar.com/datasets/coordinate-and-time-systems/csv
- [Deep-Sky Object Classes Dataset](https://asteriastar.com/datasets/deep-sky-object-classes): 32 entities · JSON https://asteriastar.com/datasets/deep-sky-object-classes/json · CSV https://asteriastar.com/datasets/deep-sky-object-classes/csv
- [Astronomical Catalogs & Designations Dataset](https://asteriastar.com/datasets/astronomical-catalogs): 35 entities · JSON https://asteriastar.com/datasets/astronomical-catalogs/json · CSV https://asteriastar.com/datasets/astronomical-catalogs/csv

## Open Data API (v0)
Read-only, deterministic, engine-backed JSON API. Every response carries a provenance envelope (apiVersion, schemaVersion, dataVersion, generatedAt, source, license, attribution). No auth, no rate limits, no write endpoints. OpenAPI 3.1: https://asteriastar.com/api/v0/openapi.json. Reference: https://asteriastar.com/developers/api.
- GET https://asteriastar.com/api/v0/entities — List entities (e.g. https://asteriastar.com/api/v0/entities?type=planet&limit=8)
- GET https://asteriastar.com/api/v0/entities/{id} — Get one entity (e.g. https://asteriastar.com/api/v0/entities/planet:mars)
- GET https://asteriastar.com/api/v0/relationships — List relationships (e.g. https://asteriastar.com/api/v0/relationships?from=planet:mars)
- GET https://asteriastar.com/api/v0/search — Search entities (e.g. https://asteriastar.com/api/v0/search?q=andromeda&limit=5)
- GET https://asteriastar.com/api/v0/traversal — Traverse the graph (e.g. https://asteriastar.com/api/v0/traversal?start=star:sirius&maxDepth=2)
- GET https://asteriastar.com/api/v0/assistant/explain — Grounded entity explanation (e.g. https://asteriastar.com/api/v0/assistant/explain?id=planet:mars)
- GET https://asteriastar.com/api/v0/assistant/compare — Grounded concept comparison (e.g. https://asteriastar.com/api/v0/assistant/compare?a=planet:mars&b=planet:venus)
- GET https://asteriastar.com/api/v0/assistant/path — Shortest evidence path (e.g. https://asteriastar.com/api/v0/assistant/path?from=astronomer:edwin-hubble&to=cosmology_concept:dark-energy)
- GET https://asteriastar.com/api/v0/datasets — List datasets (e.g. https://asteriastar.com/api/v0/datasets)
- GET https://asteriastar.com/api/v0/datasets/{id} — Get one dataset (e.g. https://asteriastar.com/api/v0/datasets/stars)
- GET https://asteriastar.com/api/v0/citations — List citations (e.g. https://asteriastar.com/api/v0/citations?type=peer_reviewed_paper)
- GET https://asteriastar.com/api/v0/citations/{id} — Get one citation (e.g. https://asteriastar.com/api/v0/citations/cite:mayor-queloz-1995)
- GET https://asteriastar.com/api/v0/images — List scientific images (e.g. https://asteriastar.com/api/v0/images?limit=10)
- GET https://asteriastar.com/api/v0/sources — List authoritative sources (e.g. https://asteriastar.com/api/v0/sources)
- GET https://asteriastar.com/api/v0/live-sky/providers — List live-sky providers (e.g. https://asteriastar.com/api/v0/live-sky/providers)
- GET https://asteriastar.com/api/v0/live-sky/moon — Moon phase & position (e.g. https://asteriastar.com/api/v0/live-sky/moon?latitude=50.08&longitude=14.44&timezone=Europe/Prague)
- GET https://asteriastar.com/api/v0/live-sky/sun — Sun & twilight times (e.g. https://asteriastar.com/api/v0/live-sky/sun?latitude=50.08&longitude=14.44&date=2025-06-21&timezone=Europe/Prague)
- GET https://asteriastar.com/api/v0/live-sky/planets — Planet visibility & rise/set (e.g. https://asteriastar.com/api/v0/live-sky/planets?latitude=50.08&longitude=14.44&timezone=Europe/Prague)
- GET https://asteriastar.com/api/v0/live-sky/tonight — Tonight observing dashboard (e.g. https://asteriastar.com/api/v0/live-sky/tonight?latitude=50.08&longitude=14.44&timezone=Europe/Prague)
- GET https://asteriastar.com/api/v0/openapi.json — OpenAPI document (e.g. https://asteriastar.com/api/v0/openapi.json)
- GET https://asteriastar.com/api/v0/contribution-types — List contribution types (e.g. https://asteriastar.com/api/v0/contribution-types)
- GET https://asteriastar.com/api/v0/review-states — List review states (e.g. https://asteriastar.com/api/v0/review-states)
- GET https://asteriastar.com/api/v0/contribution-guidelines — Contribution guidelines (e.g. https://asteriastar.com/api/v0/contribution-guidelines)
Checksummed exports (SHA-256 in the manifest):
- entities-index: https://asteriastar.com/exports/entities-index.json — 5802 records
- relationships-index: https://asteriastar.com/exports/relationships-index.json — 9009 records
- dataset-catalogue: https://asteriastar.com/exports/dataset-catalogue.json — 18 records
- source-registry: https://asteriastar.com/exports/source-registry.json — 35 records
- image-catalogue: https://asteriastar.com/exports/image-catalogue.json — 21 records
- live-sky-providers: https://asteriastar.com/exports/live-sky-providers.json — 9 records

## Contribute (scientific contributions & review workflow)
A controlled, review-first workflow (architecture preview). Every contribution is a structured PROPOSAL attached to a real knowledge-graph object — validated and reviewed before any versioned change. Not public editing, not a social network. 15 contribution types, 12 review states, 8 roles. No accounts, no database, no live submissions, no fabricated contributors/reviews/approvals.
- [Contribute](https://asteriastar.com/contribute)
- [How it works](https://asteriastar.com/contribute/how-it-works): The review-first lifecycle every contribution follows, from proposal to a versioned graph update.
- [Guidelines](https://asteriastar.com/contribute/guidelines): What makes a good, sourced, reviewable contribution — and what the review looks for.
- [Contributing sources](https://asteriastar.com/contribute/sources): Add or strengthen the authoritative sources and citations behind entities and relationships.
- [Contributing images](https://asteriastar.com/contribute/images): Submit verified scientific images and correct image metadata — provenance required.
- [Contributing translations](https://asteriastar.com/contribute/translations): Suggest localized titles and descriptions so the platform reads in more languages.
- [Scientific review](https://asteriastar.com/contribute/scientific-review): How domain experts verify accuracy and evidence before a factual change is accepted.
- [Editorial review](https://asteriastar.com/contribute/editorial-review): How editors check scope, clarity, policy, and route proposals to the right track.
- [Standards](https://asteriastar.com/contribute/standards): Evidence levels, domain separation, licensing, and the quality dimensions contributions improve.
- [Proposal templates](https://asteriastar.com/contribute/templates): Copyable, non-submitting templates for the most common kinds of contribution.
- [Roadmap](https://asteriastar.com/contribute/roadmap): What exists today (architecture) and what a future review system will add.
- [Review dashboard](https://asteriastar.com/contribute/review-dashboard): How reviewers will see coverage, tracks, and open work. Empty today — no fabricated metrics.
- [Review queue](https://asteriastar.com/contribute/review-queue): Where submitted proposals will await triage and review. Empty today — no fabricated tickets.
- [Change log](https://asteriastar.com/contribute/change-log): The versioned record of accepted changes. Empty today — no fabricated approvals.
- [Audit trail](https://asteriastar.com/contribute/audit-trail): The immutable, per-proposal history of every state change. Empty today — no fabricated history.
- Read-only APIs: https://asteriastar.com/api/v0/contribution-types · https://asteriastar.com/api/v0/review-states · https://asteriastar.com/api/v0/contribution-guidelines
- Planned (not implemented): POST /api/v1/contributions

## Policies
- [About](https://asteriastar.com/about)
- [Editorial Policy](https://asteriastar.com/editorial-policy)
- [Sources Policy](https://asteriastar.com/sources-policy)