{"dataset":{"slug":"astrochemistry-and-molecules","title":"Astrochemistry & the Molecular Universe","description":"The chemistry of space — the interstellar environments, the interstellar molecules (water, CO, ammonia, methanol, PAHs, prebiotic precursors), and the astrochemical processes that build and destroy them.","version":"1.0.0","lastGenerated":"2026-06-29","license":"CC BY-SA 4.0","entityCount":20,"sources":["nasa","eso"]},"entities":[{"id":"interstellar_molecule:amino-acid-precursors","name":"Amino-Acid Precursors","type":"interstellar_molecule","domain":"science","description":"The molecular building blocks from which amino acids can form — some detected in space and in the ices of comets, and amino acids themselves found in meteorites such as Murchison. They link the chemistry of the interstellar medium to the origin of life.","entryPath":"/astrochemistry/amino-acid-precursors"},{"id":"interstellar_molecule:ammonia","name":"Ammonia","type":"interstellar_molecule","domain":"science","description":"One of the first polyatomic molecules found in space, and a sensitive thermometer of dense cloud cores: the relative strengths of its radio lines reveal the temperature of the cold gas about to collapse into stars.","entryPath":"/astrochemistry/ammonia"},{"id":"interstellar_molecule:carbon-dioxide","name":"Carbon Dioxide","type":"interstellar_molecule","domain":"science","description":"A common component of the icy mantles that coat interstellar dust grains, detected by the infrared absorption its ice produces against background starlight. Its abundance in ices records the chemistry and radiation history of a cloud.","entryPath":"/astrochemistry/carbon-dioxide"},{"id":"interstellar_molecule:carbon-monoxide","name":"Carbon Monoxide","type":"interstellar_molecule","domain":"science","description":"After molecular hydrogen, the most abundant molecule in space — and, because hydrogen is hard to see directly in cold gas, the workhorse tracer astronomers use to map molecular clouds and measure how much gas is available to form stars.","entryPath":"/astrochemistry/carbon-monoxide"},{"id":"astrochemical_process:cometary-and-meteoritic-chemistry","name":"Cometary & Meteoritic Chemistry","type":"astrochemical_process","domain":"science","description":"The record of the early Solar System's chemistry preserved in comets and meteorites — the amino acids in the Murchison meteorite, the ancient inclusions of Allende, and the ices of comets — a frozen archive of the material that built the planets.","entryPath":"/astrochemistry/cometary-and-meteoritic-chemistry"},{"id":"astrochemical_process:gas-phase-chemistry","name":"Gas-Phase Chemistry","type":"astrochemical_process","domain":"science","description":"Chemistry that happens in the gas between grains, driven especially by fast ion–molecule reactions that proceed even at the frigid temperatures of interstellar clouds. It builds many of the simple molecules seen in space.","entryPath":"/astrochemistry/gas-phase-chemistry"},{"id":"astrochemical_process:grain-surface-chemistry","name":"Grain-Surface Chemistry","type":"astrochemical_process","domain":"science","description":"Chemistry that happens on the icy mantles of dust grains, where atoms and molecules land, wander, and meet. It makes molecules the gas phase cannot — water and methanol among them — and is the source of much of space's complex organic chemistry.","entryPath":"/astrochemistry/grain-surface-chemistry"},{"id":"interstellar_molecule:hydrogen-cyanide","name":"Hydrogen Cyanide","type":"interstellar_molecule","domain":"science","description":"A simple nitrogen-bearing molecule widespread in space and central to prebiotic chemistry — many proposed routes to the building blocks of life pass through hydrogen cyanide and its relatives.","entryPath":"/astrochemistry/hydrogen-cyanide"},{"id":"interstellar_environment:interstellar-dust","name":"Interstellar Dust","type":"interstellar_environment","domain":"science","description":"The tiny grains of silicate and carbon — often coated in mantles of ice — that pervade the interstellar medium. They redden and dim starlight, radiate in the infrared, and, crucially, provide the surfaces on which many molecules are built.","entryPath":"/astrochemistry/interstellar-dust"},{"id":"interstellar_molecule:methanol","name":"Methanol","type":"interstellar_molecule","domain":"science","description":"A key complex organic molecule that forms not in the gas but on the icy surfaces of dust grains, by the step-by-step addition of hydrogen to frozen carbon monoxide. It is a stepping stone toward the larger organic molecules found around young stars.","entryPath":"/astrochemistry/methanol"},{"id":"interstellar_environment:molecular-cloud","name":"Molecular Clouds","type":"interstellar_environment","domain":"science","description":"Cold, dense clouds of molecular hydrogen and dust, dark and shielded from starlight, where nearly all the interstellar molecules reside and where stars are born. They are the richest chemical factories in the galaxy, mapped in the millimetre and submillimetre.","entryPath":"/astrochemistry/molecular-cloud"},{"id":"astrochemical_process:photochemistry","name":"Photochemistry","type":"astrochemical_process","domain":"science","description":"Chemistry driven by ultraviolet starlight, which breaks molecules apart and ionises atoms at the illuminated edges of clouds and the surfaces of disks — both destroying molecules and opening new reaction pathways.","entryPath":"/astrochemistry/photochemistry"},{"id":"astrochemical_process:planet-formation-chemistry","name":"Planet-Formation Chemistry","type":"astrochemical_process","domain":"science","description":"The chemistry of protoplanetary disks that decides what new planets are made of — where ices freeze out, which molecules end up in comets and which in planetary atmospheres, and how much water and organic material a world inherits.","entryPath":"/astrochemistry/planet-formation-chemistry"},{"id":"interstellar_molecule:polycyclic-aromatic-hydrocarbons","name":"Polycyclic Aromatic Hydrocarbons","type":"interstellar_molecule","domain":"science","description":"Large, flat molecules of linked carbon rings that pervade the galaxy, glowing in a distinctive set of infrared bands and locking up a large share of interstellar carbon. The James Webb Space Telescope maps their emission across galaxies.","entryPath":"/astrochemistry/polycyclic-aromatic-hydrocarbons"},{"id":"astrochemical_process:prebiotic-chemistry","name":"Prebiotic Chemistry","type":"astrochemical_process","domain":"science","description":"The astrochemistry of molecules relevant to the origin of life — how the building blocks of biology can be assembled in interstellar clouds, on icy grains, and in the young Solar System, and delivered to a planet's surface.","entryPath":"/astrochemistry/prebiotic-chemistry"},{"id":"interstellar_environment:protoplanetary-disk","name":"Protoplanetary Disks","type":"interstellar_environment","domain":"science","description":"The disks of gas and dust that surround young stars, out of which planets, moons, and comets form. Their chemistry — imaged in exquisite detail by ALMA — sets the raw ingredients that new planets and their atmospheres are built from.","entryPath":"/astrochemistry/protoplanetary-disk"},{"id":"astrochemical_process:shock-chemistry","name":"Shock Chemistry","type":"astrochemical_process","domain":"science","description":"Chemistry triggered when gas is suddenly heated and compressed — by the outflows of newborn stars or the blast waves of supernovae. Shocks sputter material off dust grains and power reactions that need high temperatures, changing a cloud's chemistry.","entryPath":"/astrochemistry/shock-chemistry"},{"id":"interstellar_environment:star-forming-region","name":"Star-Forming Regions","type":"interstellar_environment","domain":"science","description":"The dense cores of molecular clouds where gravity pulls gas together into new stars, and where the heat and radiation of those young stars drive a burst of chemistry. The Orion Nebula is the nearest region of massive star formation and the most-studied example.","entryPath":"/astrochemistry/star-forming-region"},{"id":"interstellar_environment:diffuse-interstellar-medium","name":"The Diffuse Interstellar Medium","type":"interstellar_environment","domain":"science","description":"The thin, warm, mostly atomic gas that fills the space between the stars, laced with dust that reddens the light passing through it. Even here, exposed to starlight, the first simple molecules form — the beginning of cosmic chemistry.","entryPath":"/astrochemistry/diffuse-interstellar-medium"},{"id":"interstellar_molecule:water","name":"Water","type":"interstellar_molecule","domain":"science","description":"One of the most abundant molecules in the universe, present as gas, as ice frozen onto dust grains, and in the disks where planets form. Tracing where water is inherited from the interstellar medium versus made in disks is central to understanding how worlds get their oceans.","entryPath":"/astrochemistry/water"}]}