The Alien Concept: A Scientific Inquiry into Extraterrestrial Life and Intelligence

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Alien denotes a hypothetical intelligent extraterrestrial being and is part of scientific efforts to understand life beyond Earth and how it could be studied, with Erik Gregersen's revisions, citations in MLA/APA/Chicago formats, and access to external resources and feedback.

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Alien | extraterrestrial life | Britannica
britannica.com

Alien | extraterrestrial life | Britannica

Alien, hypothetical intelligent extraterrestrial being. See extraterrestrial intelligence. See also extraterrestrial life; unidentified flying