Definition
A biosignature is a phenomenon that can be explained by biological processes where all possible abiotic causes of this phenomenon have been eliminated. This term is mainly used in the field of astrobiology in the search for past or present extraterrestrial life, from planets and moons in the Solar System to exoplanets. Candidate biosignatures strongly indicate some of the earliest known life forms, aid studies of the origin of life on Earth as well as the possibility of life on Mars, Venus and elsewhere in the universe.
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ALH84001AbiogenesisAbiotic componentActive SETIAestivation hypothesisAge of EarthAlcoholsAlien languageAlkanesAllan Hills 77005Allan Hills 84001Allen Telescope ArrayAmino acidAmmoniaAncient astronautsAngiospermApollo 17ArchaeaArcheanArecibo ObservatoryArecibo messageArthropodAssociated PressAstrobiologyAstrobiology Field LaboratoryAstrobiology Science and Technology for Exploring PlanetsAstrobiology Society of BritainAstrochemistryAstroecologyAstrolinguisticsAstrophysicsAtacama Large Millimeter/submillimeter ArrayAtmosphere of MarsAtmosphere of VenusAtmospheric sciencesBIOPANBLC1BRUIEBacteriaBacteriumBeagle 2Beagle 3BenzothiopheneBerkeley SETI Research CenterBerserker hypothesisBioSentinelBioastronauticsBiochemistryBiodegradationBiofilmBiofluorescenceBiogenic silicaBioindicatorBiolabBiological Oxidant and Life DetectionBiomarkerBiomarker (disambiguation)Biomarker (medicine)BiomarkersBiomineralizationBiomoleculeBion (satellite)BiopolymerBiosatellite programBitumenBracewell probeBreakthrough Enceladus missionBreakthrough InitiativesBreakthrough ListenBreakthrough MessageBreakthrough StarshotBromophenol blueBrookings ReportCAESAR (spacecraft)CI1 fossilsCTA-102Cambrian explosionCarbonCarbon-12Carbon-14Carbonate rockCarl Sagan InstituteCassini–HuygensCell (biology)Cell membraneCenter for Life Detection ScienceChang'e 4Chemical synthesisChemistryCheyava FallsChirality (chemistry)ChlorobenzeneChloromethaneCircumstellar habitable zoneCommunication with extraterrestrial intelligenceCornell UniversityCosmic pluralismCuriosity (rover)Curiosity roverDNADark forest hypothesisDarwin (spacecraft)DecaneDeep Sea Drilling ProgramDefinition of lifeDihydronaphthaleneDimethyl disulfideDimethyl sulfideDinosaurDirect imagingDirected panspermiaDodecaneDragonfly (Titan space probe)Drake equationEPIC 204278916EXPOSEEarliest known life formsEarth analogEdiacaran biotaEnceladusEnceladus ExplorerEnceladus Life FinderEnceladus Life Signatures and HabitabilityEnceladus OrbilanderEpicuticular waxEuCROPISEurekAlert!Europa (moon)Europa ClipperEuropa Lander (NASA)European Astrobiology Network AssociationEvolutionEvolution of birdsEvolution of fungiEvolution of mammalsEvolution of molluscsEvolution of photosynthesisEvolution of primatesEvolution of sexual reproductionEvolutionary biologyEvolutionary history of plantsExoLanceExoMarsExobiology Radiation AssemblyExoplanetExoplanetologyExotheologyExplorer of Enceladus and TitanExposing Microorganisms in the StratosphereExtraterrestrial atmospheresExtraterrestrial hypothesisExtraterrestrial intelligenceExtraterrestrial lifeExtraterrestrial liquid waterExtraterrestrial sample curationExtraterrestrials in fictionExtremely Large TelescopeExtremophileFalse positives and false negativesFast radio burstFatty acidsFatty alcoholFermi paradoxFirstborn hypothesisFischer–Tropsch processFobos-GruntFossilFossil history of flowering plantsFoton-MGalactic habitable zoneGale CraterGalilean moonsGalileo (spacecraft)Gas chromatographyGauss's Pythagorean right triangle proposalGeobiologyGeochemistGeochemistryGeologistsGeology of MarsGeomicrobiologyGiada ArneyGreat FilterGreat Oxidation EventGreigiteHD 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 Worlds ObservatoryHabitable zone for complex lifeHadeanHart–Tipler conjectureHayabusa2HemolithinHeterocyclic compoundHistory of the extraterrestrial life debateHominoidHomochiralityHubble Space TelescopeHypothetical types of biochemistryIcebreaker LifeInterplanetary contaminationInterstellar communicationIonic chargeIronIron phosphateIron sulfideIsotopeJames Clerk Maxwell TelescopeJames LovelockJames Webb Space TelescopeJezero (crater)Jezero CraterJoshua LederbergJourney to Enceladus and TitanJuno (spacecraft)Jupiter Icy Moons ExplorerK2-18bKardashev scaleKathrin AltweggKazachokKerogenKmL4 (spacecraft)Laplace-PLast universal common ancestorLife Investigation For EnceladusLife on MarsLife on TitanLife on VenusLight-yearLightningLincos languageLipidLipidsList of alleged extraterrestrial beingsList of microorganisms tested in outer spaceList of potentially habitable exoplanetsLiving Interplanetary Flight ExperimentLiving organismsLong Duration Exposure FacilityLubricantMELOSMagneticMagnetiteMagnetometerMariner 7Mars 2020Mars Astrobiology Explorer-CacherMars Geyser HopperMars Science LaboratoryMars sample-return missionMars sample return missionMass spectrometerMass spectrometryMediocrity principleMembrane lipidMetabolic wasteMetabolismMeteoriteMethaneMethane on MarsMethanogenesisMethyl benzoateMethylnaphthaleneMicrobesMicrobiologyMicrofossilMicrofossilsMicropaleontologyMineralMolecular massMorphology (biology)MudstoneMulticellular organismMurchison meteoriteMyrNASA Astrobiology InstituteNIROSETINakhla meteoriteNaphthaleneNational GeographicNatural methane on MarsNature (journal)NeocatastrophismNeoproterozoic oxygenation eventNexus for Exoplanet System ScienceNitrogen fixationNon-planetary abiogenesisNoosphereNorthern Light (spacecraft)Nucleic acidsO/OREOSOREOcubeOSIRIS-RExOcean Worlds Exploration ProgramOcean planetOceanus (Titan orbiter)Oil spillOleananeOpportunity (rover)Organic compoundOrganic compoundsOrganic matterOrganismOrigin of life on EarthOrigin of water on EarthOutcropOutline of extraterrestrial lifeOxygenOzonePSR B1919+21Pale Blue DotPaleontologyPanspermiaParsecPeatPerseverance (rover)PetroleumPhanerozoicPhoenix (spacecraft)PhosphatePhosphinePhotochemistryPhotodissociationPhotosynthesisPhotosynthetic pigmentPhototrophPhytanePioneer VenusPioneer plaquePlanetarium hypothesisPlanetary habitabilityPlanetary habitability in the Solar SystemPlanetary oceanographyPlanetary protectionPlanetary sciencePlanktonPlantPolyelectrolytePolyelectrolyte theory of the genePolymerPolythiophenePorphyrinPost-detection policyPotential cultural impact of extraterrestrial contactPrebiotic (chemistry)Primordial soupPristaneProject CyclopsProject OzmaProject Phoenix (SETI)ProteinProterozoicProxima Centauri bPublic domainRNARare Earth hypothesisRedoxRedox reactionReflectanceRosalind Franklin (rover)Rosetta (spacecraft)SERENDIPSETI@homeSHGb02+14aSample Analysis at MarsSan Marino ScaleSaturnSchiaparelli EDM landerScience (journal)Search for extraterrestrial intelligenceSetiQuestShergotty meteoriteSolar SystemSource rockSpace.comSpaceX Red DragonSpace Flyer UnitSpanish Astrobiology CenterSpectral lineSpirit (rover)SteraneStromatoliteStromatolitesSuperhabitable planetTHEOTabby's StarTanpopo (mission)Tanpopo missionTaphonomyTechnosignatureTerrestrial Planet FinderTesting the Habitability of Enceladus's OceanTetramethylbenzeneTetrapodThe New York TimesThe Washington PostThiopheneThirty Meter TelescopeTholinTianwen-1Timeline of Mars Science LaboratoryTimeline of the evolutionary history of lifeTitan (moon)Titan Mare ExplorerTrace Gas OrbiterTrident (spacecraft)TrimethylbenzeneUFO religionUltravioletUndecaneUnicellular organismUniformity of motiveVVV-WIT-07Vegetable Production SystemVenera 8Venus ExpressVenus In Situ ExplorerVenus Life FinderVictoria MeadowsViking 1Viking 2Viking biological experimentsViking lander biological experimentsViking programVivianiteVoyager 1Voyager Golden RecordWater hole (radio)Wired (magazine)Wow! signalXenoarchaeologyYamato 000593Zhurong (rover)Zoo hypothesisΔ13C
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