Extraterrestrial UFO hypothesis

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

UFOs and ufology
Notable sightings and hoaxes
Conspiracy theories
Religions
Lists of organizations, sightings, studies, etc.
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