Extraterrestrial hypothesis  

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The extraterrestrial hypothesis (ETH) is the hypothesis that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by extraterrestrial life or non-human aliens from other planets visiting Earth.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Extraterrestrial hypothesis" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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