Grouping | Science fiction |
---|---|
Similar entities | Cryptids |
Other name(s) | Aliens, space aliens |
An extraterrestrial or alien is a lifeform that did not originate on Earth. The word extraterrestrial means "outside Earth". Extraterrestrials are a common theme in modern science-fiction, and also appeared in much earlier works such as the second-century parody True History[1] by Lucian of Samosata.[2]
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