Definition
There are several hypotheses of the possibility of life originating in the universe in places other than planets, dated as early as 1774. Suggested locations are within stars, on the surface of stars, as well as in the interstellar space.
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AbiogenesisActive SETIAestivation hypothesisAlien languageAllan Hills 77005Allan Hills 84001Allen Telescope ArrayAncient astronautsAphotic zoneApollo 17Arecibo ObservatoryArecibo messageAstrobiologyAstrobiology Field LaboratoryAstrobiology Science and Technology for Exploring PlanetsAstrobiology Society of BritainAstrochemistryAstroecologyAstrolinguisticsAstrophysicsAtmospheric sciencesAtomic nucleusBIOPANBLC1BRUIEBeagle 2Beagle 3Berkeley SETI Research CenterBerserker hypothesisBioSentinelBioastronauticsBiochemistryBiolabBiological Oxidant and Life DetectionBiomoleculeBion (satellite)Biosatellite programBiosignatureBlack holes in fictionBracewell probeBreakthrough Enceladus missionBreakthrough InitiativesBreakthrough ListenBreakthrough MessageBreakthrough StarshotBrian StablefordBrookings ReportBrown dwarfCAESAR (spacecraft)CI1 fossilsCTA-102Carbon chauvinismCarl Sagan InstituteCenter for Life Detection ScienceChang'e 4Circumstellar habitable zoneClifford A. PickoverCommunication with extraterrestrial intelligenceCosmic pluralismCosmic stringCuriosity (rover)Dark forest hypothesisDarwin (spacecraft)David LangfordDefinition of lifeDirected panspermiaDragonfly (Titan space probe)Drake equationEPIC 204278916EXPOSEEarliest known life formsEarth analogEnceladus ExplorerEnceladus Life FinderEnceladus Life Signatures and HabitabilityEnceladus OrbilanderEntropyErnst Julius ÖpikEuCROPISEuropa ClipperEuropa Lander (NASA)European Astrobiology Network AssociationEvolutionary biologyExoLanceExoMarsExobiology Radiation AssemblyExoplanetologyExotheologyExplorer of Enceladus and TitanExposing Microorganisms in the StratosphereExtraterrestrial hypothesisExtraterrestrial intelligenceExtraterrestrial lifeExtraterrestrial liquid waterExtraterrestrial sample curationExtraterrestrials in fictionExtremophileFast radio burstFermi paradoxFirstborn hypothesisFobos-GruntFoton-MFrank DrakeGalactic habitable zoneGary WestfahlGauss's Pythagorean right triangle proposalGeomicrobiologyGeorge Mann (writer)Graham SleightGreat FilterHD 164595Habitability of F-type main-sequence star systemsHabitability of G-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 systemsHabitable zone for complex lifeHart–Tipler conjectureHayabusa2HemolithinHistory of the extraterrestrial life debateHydrogen sulfideHypothetical types of biochemistryIcebreaker LifeInterplanetary contaminationInterstellar communicationJohn CluteJourney to Enceladus and TitanJupiter Icy Moons ExplorerKardashev scaleKazachokL4 (spacecraft)Laplace-PLifeLife Investigation For EnceladusLife on MarsLife on TitanLife on VenusLincos languageList of alleged extraterrestrial beingsList of microorganisms tested in outer spaceList of potentially habitable exoplanetsLiving Interplanetary Flight ExperimentLong Duration Exposure FacilityMELOSMagnetic monopoleMain-sequence starMars 2020Mars Astrobiology Explorer-CacherMars Geyser HopperMars Science LaboratoryMars sample-return missionMars sample return missionMediocrity principleMicrobiologyMurchison meteoriteNASA Astrobiology InstituteNIROSETINakhla meteoriteNebulaNeocatastrophismNeutron starNexus for Exoplanet System ScienceNoosphereNorthern Light (spacecraft)O/OREOSOREOcubeOSIRIS-RExOcean Worlds Exploration ProgramOcean planetOceanus (Titan orbiter)Opportunity (rover)Outline of extraterrestrial lifePSR B1919+21PaleontologyPanspermiaPerseverance (rover)Phoenix (spacecraft)Pioneer plaquePlanetarium hypothesisPlanetary chauvinismPlanetary habitabilityPlanetary habitability in the Solar SystemPlanetary oceanographyPlanetary protectionPlanetary sciencePost-detection policyPotential cultural impact of extraterrestrial contactProject CyclopsProject OzmaProject Phoenix (SETI)Rare Earth hypothesisRosalind Franklin (rover)Rosetta (spacecraft)SERENDIPSETI@homeSHGb02+14aSan Marino ScaleScience fictionScientific AmericanSearch for extraterrestrial intelligenceSelf-organizationSetiQuestShergotty meteoriteSpaceX Red DragonSpace Flyer UnitSpanish Astrobiology CenterSpirit (rover)Stars in fictionSunSunspotSuperhabitable planetTHEOTabby's StarTanpopo (mission)Tanpopo missionTechnosignatureTerrestrial Planet FinderThe Encyclopedia of Science FictionTholinTianwen-1Titan Mare ExplorerTrace Gas OrbiterTrident (spacecraft)UFO religionUniformity of motiveVVV-WIT-07Vadim TsytovichVegetable Production SystemVenus In Situ ExplorerViking 1Viking 2Viking lander biological experimentsVoyager Golden RecordWater hole (radio)William HerschelWow! signalXenoarchaeologyYamato 000593Zhurong (rover)Zoo hypothesis
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