Extraterrestrial life, alien life, or colloquially simply aliens is life which does not originate from Earth. No extraterrestrial life has yet been conclusively detected. Wikipedia
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In the comic, a search party gathers around a landed alien craft, but it can find no sign of alien beings. Radio announcers warn those nearby to stay indoors.
We are not alone in the universe. A few years ago, this notion seemed farfetched; today, the existence of extraterrestrial intelligence is taken for granted ...