Extraterrestrial life
Extraterrestrial Life
Extraterrestrial life (pronunciation: /ˌɛk.strə.təˈrɛs.tri.əl ˈlaɪf/), also known as alien life (not to be confused with aliens in immigration law), is life that originates outside of Earth. The etymology of the term "extraterrestrial" originates from the Latin words "extra" meaning "outside" and "terra" meaning "earth".
Extraterrestrial life is a subject of Astrobiology, the study of life in the universe. Astrobiology makes use of Physics, Astronomy, and Biology to investigate the possibility of life on other planets and the effects of extraterrestrial environments on living organisms.
The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy.
The search for extraterrestrial life includes scientific research and methodologies such as SETI, the search for extraterrestrial intelligence, which attempts to detect signals of intelligent life from other planets.
Related terms include Exobiology, the study of the origin, evolution, distribution, and future of life in the universe, and Panspermia, the hypothesis that life exists throughout the universe, distributed by meteoroids, asteroids, comets, planetoids, and also by spacecraft in the form of unintended contamination by microorganisms.
External links
- Medical encyclopedia article on Extraterrestrial life
- Wikipedia's article - Extraterrestrial life
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