Answer ( 1 )

  1. An unidentified flying object or UFO, is defined as a perceived object in the sky, not identifiable by standard criteria.In other terms ,Any airborne object which by performance, aerodynamic characteristics, or unusual features, does not conform to any presently known aircraft or missile type, or which cannot be positively identified as a familiar object. The term is widely used for claimed observations of extraterrestrial craft.

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