exobiology
Extraterrestrial life research
Exobiology is the study of life beyond Earth—its possible existence, origins, and characteristics.
The field draws on astronomy, biology, and chemistry to investigate where extraterrestrial life might exist and how we might detect it.
Since no such life has been confirmed, exobiology remains largely theoretical, focusing on environments like Mars or Europa that might support organisms.
Also called astrobiology.
Detectable signs of life
- extremophilesOrganisms surviving extreme conditions
- habitabilitySuitability for dwelling
- panspermiaLife spreads via space rocks
- abiogenesisLife from inanimate matter
biogenesis · SETI · exoplanets · habitable zone · Drake equation · Fermi paradox · technosignatures · water worlds
Red planet, war deity
- EuropaGalilean moon with subsurface ocean
- EnceladusIcy moon with geysers
- TitanMythic giant or moon
- space probeRobotic interplanetary research vessel
rover · lander · orbiter · Curiosity · Perseverance · Cassini · hydrothermal vents · remote sensing
Being from outer space
- alienNon-native being
- E.T.Extraterrestrial being
- first contactHumanity's alien introduction
- War of the WorldsFictional extraterrestrial invasion narrative
The Andromeda Strain · Solaris · science fiction · close encounters · alien intelligence
Cellular nutrient conversion
- cellularComposed of small units
- organismsIndividual living entities
- DNAHereditary code molecule
- RNAGene expression molecule
proteins · enzymes · microbes · reproduction · adaptation · carbon-based · silicon-based · amino acids
Organisms surviving extreme conditions
- hydrothermalHot water underground
- thermophilesOrganisms requiring high temperatures
- volcanicOf fiery mountain origin
- hypersalineExcessively high salt concentration
biosignatures
Detectable signs of life
- extremophilesOrganisms surviving extreme conditions
- habitabilitySuitability for dwelling
- panspermiaLife spreads via space rocks
abiogenesis · biogenesis · SETI · exoplanets · habitable zone · Drake equation · Fermi paradox · technosignatures · water worlds · prebiotic chemistry
Mars
Red planet, war deity
space probe · rover · lander · orbiter · Curiosity · Perseverance · Cassini · hydrothermal vents · remote sensing · spectrometry
extraterrestrial
Being from outer space
- alienNon-native being
- E.T.Extraterrestrial being
- first contactHumanity's alien introduction
War of the Worlds · The Andromeda Strain · Solaris · science fiction · close encounters · alien intelligence
metabolism
Cellular nutrient conversion
RNA · proteins · enzymes · microbes · reproduction · adaptation · carbon-based · silicon-based · amino acids · chirality
extremophiles
Organisms surviving extreme conditions
- hydrothermalHot water underground
- thermophilesOrganisms requiring high temperatures
- volcanicOf fiery mountain origin
exobiologyecology
Study of environmental relations
marine biology · microbiology · botany · zoology · evolutionary biology