"Extraterrestrial life is life that does not originate from Earth. It is also called alien life, or, if it is a sentient and/or relatively complex individual, an \"extraterrestrial\" or \"alien\" (or, to avoid confusion with the legal sense of \"alien\", a \"space alien\"). These as-yet-hypothetical life forms range from simple bacteria-like organisms to beings with civilizations far more advanced than humanity."@en . . . . . .