Definition
A hycean planet is a hypothetical type of planet with liquid water oceans underneath a hydrogen-rich atmosphere. They are thought to offer conditions favorable to life.
Related concepts
A-type main-sequence starAbiogenesisAccretion (astrophysics)Accretion diskAdiabatic processAlbedoAmmoniaAsteroid beltAsteroidal waterAstrobiologyAstrometryAstronomical unitAstrooceanographyAtmosphereAtmospheric circulationB-type main-sequence starBBC NewsBinary starBiomarkerBiosignatureBlanetBlend wordBlightBrown dwarfCarbon dioxideCarbon planetCarl Sagan InstituteCatalog of Nearby Habitable SystemsCatastrophically evaporating planetChristopher NolanChthonian planetCircumbinary planetCircumplanetary diskCircumstellar discCircumstellar envelopeCircumstellar habitable zoneCircumtriple planetCo-orbital configurationCold JupiterCoreless planetCosmic dustCosmic shorelineDebris diskDefinition of planetDesert planetDetached objectDeuterium-depleted waterDimethyl disulfideDimethyl sulfideDiscoveries of exoplanetsDisrupted planetDoppler spectroscopyDouble planetDoubly labeled waterDwarf planetEarthEarth analogEarth massEarth radiusEccentric JupiterEccentricity (astronomy)EcumenopolisEnceladusEuropa (moon)ExocometExomoonExoplanetExoplanet Data ExplorerExoplanet interiorsExoplanet naming conventionExoplanet orbital and physical parametersExoplanetary Circumstellar Environments and Disk ExplorerExozodiacal dustExtragalactic planetExtrasolar Planets EncyclopaediaExtrasolar planets in fictionExtraterrestrial liquid waterExtraterrestrial materialsExtraterrestrial sample curationEyeball planetF-type main-sequence starForced eccentricityFormation and evolution of the Solar SystemG-type main-sequence starGalactic habitable zoneGas giantGeodynamics of terrestrial exoplanetsGiant-impact hypothesisGiant planetGlobular clusterGravitational collapseGravitational microlensingGreenhouse effectHabitabilityHabitability of F-type main-sequence star systemsHabitability of K-type main-sequence star systemsHabitability of binary star systemsHabitability of natural satellitesHabitability of neutron star systemsHabitability of red dwarf systemsHabitability of yellow dwarf systemsHabitable zoneHabitable zone for complex lifeHazeHeavy waterHeliumHelium planetHerbig Ae/Be starHills cloudHot JupiterHot NeptuneHydrobiologyHydrogenHydrogen chalcogenideHydrologyHydroniumHydrosphereHypothetical astronomical objectIAU definition of planetIceIce giantIce planetInfraredInternal energyInterplanetary dust cloudInterplanetary mediumInterplanetary spaceInterstellar (film)Interstellar cloudInterstellar cometInterstellar dustInterstellar mediumIron planetJames Webb Space TelescopeJupiter-mass binary objectJupiter analogueK-type main-sequence starK2-18bK2-3bK2-3cKepler-138Kepler space telescopeKuiper beltLTT 1445LTT 3780 cL 98-59 dLake stratificationLava planetLava worldLifeList of directly imaged exoplanetsList of exoplanet extremesList of exoplanet firstsList of exoplanet search projectsList of exoplanets detected by microlensingList of exoplanets detected by radial velocityList of exoplanets detected by timingList of exoplanets discovered before 2000List of exoplanets discovered between 2000–2009List of exoplanets discovered by the Kepler space telescopeList of exoplanets discovered in 2010List of exoplanets discovered in 2011List of exoplanets discovered in 2012List of exoplanets discovered in 2013List of exoplanets discovered in 2014List of exoplanets discovered in 2015List of exoplanets discovered in 2016List of exoplanets discovered in 2017List of exoplanets discovered in 2018List of exoplanets discovered in 2019List of exoplanets discovered in 2020List of exoplanets discovered in 2021List of exoplanets discovered in 2022List of exoplanets discovered in 2023List of exoplanets discovered in 2024List of exoplanets discovered in 2025List of exoplanets discovered in 2026List of exoplanets observed during Kepler's K2 missionList of extrasolar candidates for liquid waterList of interstellar and circumstellar moleculesList of largest exoplanetsList of most massive exoplanetsList of multiplanetary systemsList of nearest exoplanetsList of nearest terrestrial exoplanet candidatesList of planet typesList of potentially habitable exoplanetsList of proper names of exoplanetsList of resolved circumstellar disksList of transiting exoplanetsLists of exoplanetsLists of planetsLunar waterMega-EarthMesoplanetMethaneMethods of detecting exoplanetsMilky WayMini-NeptuneMolecular cloudMonthly Notices of the Royal Astronomical SocietyNASA Exoplanet ArchiveNASA Star and Exoplanet DatabaseNature AstronomyNebular hypothesisNeptuneNeptunian desertNeptunian exoplanetNexus for Exoplanet System ScienceNikku MadhusudhanOcean stratificationOcean temperatureOcean worldOort cloudOpen Exoplanet CatalogueOrbital resonanceOrganic compoundOrigin of water on EarthOuter spaceOutline of waterPhase curve (astronomy)PhotodissociationPhotospherePlanetPlanet-hosting starPlanetary-mass objectPlanetary equilibrium temperaturePlanetary habitabilityPlanetary migrationPlanetary oceanographyPlanetary sciencePlanetary systemPlanetesimalPolarimetryProperties of waterProtoplanetProtoplanetary diskPulsar planetRadial driftRed dwarfRed giantRetrograde and prograde motionRing systemRogue planetRubble pileRunaway greenhouse effectSample-return missionScattered discSecond generation planetSemiheavy waterSmall planet radius gapSolar analogSolar irradianceSpace telescopeSpectroscopySpringer PublishingStarStar formationState of matterSteamSteam worldStellar collisionStratification (water)Sub-EarthSub-NeptuneSub-brown dwarfSubdwarf B starSubgiantSudarsky's gas giant classificationSuper-EarthSuper-JupiterSuper-NeptuneSuper-puffSuperhabitable planetSuperheated steamTOI-1266 cTOI-2136 bTOI-270 cTOI-270 dTOI-776 bTOI-776 cT Tauri starTerrestrial planetThe Astrophysical JournalThe Astrophysical Journal LettersThermodynamic free energyTholinTidal heatingTidal lockingTidally detached exomoonTitan-like exoplanetTitius–Bode lawToroidal planetTransit-timing variationTransiting Exoplanet Survey SatelliteTritiated waterUV radiationUltra-cool dwarfUltra-hot JupiterUltra-hot NeptuneUltra-short period planetUniversity of CambridgeVariable starVenus-like exoplanetWarm JupiterWaterWater (data page)Water cycleWater distribution on EarthWater modelWater on MarsWater pollutionWater resource managementWater resource policyWater resourcesWater supplyWater vaporWhite dwarfX-rayYellow giant
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