Extraterrestrial life, also called alien life (or, if it is a sentient or relatively complex individual, an "extraterrestrial" or "alien"), is life that does not originate from Earth. These hypothetical life forms may range from simple single-celled organisms to beings with civilizations far more advanced than humanity. Although many scientists expect extraterrestrial life to exist in some form, there is no evidence for its existence to date. The Drake equation speculates about the existence of intelligent life elsewhere in the universe.
The science of extraterrestrial life in all its forms is known as exobiology. Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial life. The search encompasses a search for current and historic extraterrestrial life, and a narrower search for extraterrestrial intelligent life. Reflecting the category of search, methods range from the analysis of telescope and specimen data to radios used to detect and send signals of communication.
The science of extraterrestrial life in all its forms is known as exobiology. Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial life. The search encompasses a search for current and historic extraterrestrial life, and a narrower search for extraterrestrial intelligent life. Reflecting the category of search, methods range from the analysis of telescope and specimen data to radios used to detect and send signals of communication.
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