Extraterrestrials in fiction

An extraterrestrial or alien is any extraterrestrial lifeform: a lifeform that did not originate on Earth. The word extraterrestrial means "outside Earth". The first published use of extraterrestrial as a noun occurred in 1956, during the Golden Age of Science Fiction.

This article is about extraterrestrials seen in works of fiction. For claims about alleged actual aliens, see List of alleged extraterrestrial beings.
Extraterrestrials in fiction
Martian controlled Tripod, from H. G. Wells' 1898 novel The War of the Worlds
GroupingScience fiction
Similar entitiesCryptids
Other name(s)Aliens, space aliens

Extraterrestrials are a common theme in modern science-fiction, and also appeared in much earlier works such as the second-century parody True History by Lucian of Samosata.

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