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A knowledge platform for everything above Earth — astronomy, space, the night sky, celestial events, mythology, and astrology as a clearly 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

Stars
Constellations
Galaxies
Nebulae

Sky Guide

Night Sky Tonight
Moon Phase
Meteor Showers
Solar Eclipses

Astrology

Zodiac Signs
Birth Chart
Natal Chart
Rising Sign

Calculators

Natal Chart Calculator
Zodiac Sign Calculator
Rising Sign Calculator
Moon Sign Calculator

Encyclopedia

Glossary
History of Astronomy
History of Astrology
Ancient Civilizations

Observatory

Image Library
NASA Gallery
ESA Gallery
James Webb

Guides

Beginner Astronomy
How Stars Form
How Black Holes Work
How Telescopes Work

© 2026 Asteria Star. Everything above Earth — science and tradition, kept clearly apart.

About Editorial Policy Sources Policy llms.txt

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Learn Astronomy

Learning path

Learn Astronomy

A guided journey from looking up to understanding the universe.

Beginner

1.1Beginner AstronomyStart here — the essentials of looking up.
1.2What is a star?The most fundamental object in the sky.
1.3Explore the Solar SystemThe Sun, planets, and dwarf planets.

Intermediate

2.1How stars formFrom cold gas clouds to shining stars.
2.2Explore galaxiesIsland universes of stars and gas.
2.3Light-years & distanceHow we measure the cosmos.

Advanced

3.1How black holes workGravity, event horizons, and what falls in.
3.2Explore deep skyGalaxies, nebulae, clusters, and black holes.
3.3Advanced astronomyDeeper concepts and methods.

Related entities

Star
The Sun
The Sun is the star at the center of the Solar System, around which the planets and other bodies orbit.
Galaxy
The Milky Way
The barred spiral galaxy that contains the Solar System, the Sun, and all stars visible to the naked eye.
Planet
Earth
Earth is the third planet from the Sun and the only world known to support life.

Continue learning

Learn Stars →Learn Galaxies →Learn Telescopes →