Unidentified flying object/Definition

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https://en.citizendium.org/wiki/index.php?title=Unidentified_flying_object/Definition&printable=yes
A definition or brief description of Unidentified flying object.

(UFO) Any airborne object or phenomenon of unknown origin or nature, observed visually or by instruments; often linked with alleged but unproven claims of extra-terrestial origin.

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