Aliens: A WikiFocus Book details the Background, Possible basis of extraterrestrial life, Beliefs in extraterrestrial life, Early modern period, 20th century, Recent history, Scientific search for extraterrestrial life, The Drake equation and impact of Aliens.
Extraterrestrial life (from the Latin words: extra ("beyond", or "not of") and? territories ("of or belonging to Earth")) is defined as life that does not originate from Earth. Hypothetical forms of extraterrestrial life range from simple bacteria-like organisms to sapient beings far more advanced than humans.
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