Definition
In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, into an accretion disk. Most astronomical objects, such as galaxies, stars, and planets, are formed by accretion processes.
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bodiesProtogalaxyProtoplanetProtoplanetary diskProtostarPulsar planetQ-PACEQuasi-starRadial driftRed dwarfRed giantRetrograde and prograde motionRing systemRoche lobeRogue planetRosetta (spacecraft)Rubble pileSample-return missionScattered discScattered diskScience (journal)Second generation planetSmall planet radius gapSolar SystemSolar massSolar nebulaStarStar formationSteam worldStellar collisionStellar surface fusionStreaming instabilitySub-EarthSub-NeptuneSub-brown dwarfSubdwarf B starSubgiantSudarsky's gas giant classificationSunSuper-EarthSuper-JupiterSuper-NeptuneSuper-puffSuperhabitable planetT Tauri starTerrestrial planetTholinTidally detached exomoonTimeline of gravitational physics and relativityTitan-like exoplanetTitius–Bode lawToroidal planetTransit-timing variationTrifid NebulaUltra-cool dwarfUltra-hot JupiterUltra-hot NeptuneUltra-short period planetUltravioletUniverseUranusVan der Waals forceVariable starVenus-like exoplanetViktor SafronovWarm JupiterWeak-lined T 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