The following outline is provided as an overview of and topical guide to extraterrestrial life:

Contents

• Search
• Likely requirements
• Potential locations
• Possible traits
• Ideas
• Fringe and conspiracy theories
• Extraterrestrial life media
• Persons influential in extraterrestrial life
• Extraterrestrial life in fiction
• References

Extraterrestrial life – is any type of lifeform, from prokaryotes to intelligent beings, that is neither native of Earth or transplanted from it. So far, no extraterrestrial life has ever been found. ^[1]

Search

• Astrobiology
• Mars
  • Viking lander biological experiments
• Meteorites
  • Allan Hills 77005
  • Allan Hills 84001
  • Murchison meteorite
  • Nakhla meteorite
  • Shergotty meteorite
  • Yamato 000593
• Biosignatures
  • Red edge
• Search for extraterrestrial intelligence
  • Active SETI
  • Allen Telescope Array
  • Pioneer plaque
  • Project Phoenix (SETI)
  • SERENDIP
  • Technosignature
  • Xenoarchaeology
• Communication with extraterrestrial intelligence
  • Arecibo message
  • Astrolinguistics
  • Wow! signal

Likely requirements

• Circumstellar habitable zone
• Extraterrestrial liquid water
• Planetary habitability

Potential locations

• Colonization of Europa
• Habitability of K-type main-sequence star systems
• Habitability of natural satellites
• Habitability of red dwarf systems
• Habitable exoplanet
  • Earth analog
  • Superhabitable planet
• Life on Mars
• Life on Titan
• Life on Venus
• Life origination beyond planets
• Catalogs
  • Catalog of Nearby Habitable Systems

Possible traits

• Extraterrestrial intelligence
  • Alien language
• Hypothetical types of biochemistry
  • Carbon-based life
  • CHON
• Extremophile

Ideas

• Anthropocentrism
• Carbon chauvinism
• Copernican principle
• Cosmic pluralism
• Drake equation
• Extraterrestrials in Meitei culture
• Fermi paradox
  • Aestivation hypothesis
  • Great Filter
  • Rare Earth hypothesis
  • Zoo hypothesis
• Fine-tuned universe
• Kardashev scale
  • Dyson sphere
• Mediocrity principle
• Potential cultural impact of extraterrestrial contact
  • Exotheology
  • Post-detection policy

Fringe and conspiracy theories

• Ufology
  • Alien abduction
  • Close encounter
  • Contactee
  • Extraterrestrial hypothesis
  • Men in black
  • UFO religion
• Ancient astronauts

Extraterrestrial life media

Note: Only nonfiction works in this section

• Books
  • Alien Oceans
  • Cosmos (Sagan book)
  • Evolving the Alien
  • Extraterrestrial: The First Sign of Intelligent Life Beyond Earth
  • Rare Earth: Why Complex Life Is Uncommon in the Universe
• Documentaries
  • Cosmos: Possible Worlds

Persons influential in extraterrestrial life

• Giordano Bruno
• Carol Cleland
• Frank Drake
• Enrico Fermi
• Michael H. Hart
• Stephen Hawking
• Avi Loeb
• Carl Sagan
• Peter Ward

Extraterrestrial life in fiction

• Extraterrestrials in fiction
  • Alien language in science fiction
  • Ancient astronauts in popular culture
• List of fictional extraterrestrials
  • List of alien races in DC Comics
  • List of alien races in Marvel Comics
  • List of Star Trek aliens
  • List of Star Wars creatures
• Archetypes
  • Bug-eyed monster
  • Elder race
  • Energy being
  • Grey alien
  • Insectoid
  • Little green men
• Plots
  • Alien invasion
  • Big Dumb Object
  • First contact
  • Interstellar war
  • Space warfare in science fiction
  • Space travel in science fiction

References