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Unidentified flying object
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Airborne entity that has not been identified or explained
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An unidentified flying object (UFO) is an object or phenomenon seen in the sky but not yet identified or explained. The term was coined when United States Air Force (USAF) investigations into flying saucers found too broad a range of shapes reported to consider them all saucers or discs. UFOs are also known as unidentified aerial phenomena or...

Subclass of
Alien artifacts or technology in the Solar system
Facet of
UFO conspiracy theories
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