Could this unidentified object of "intense brilliance" spotted over Tehran in 1976 have just been a natural phenomenon. Some scientists think it's the best human explanation we have.
Secret Soviet spy planes? Radar hoaxes? Ball lightning? Or something from another world? Several military pilots have encountered unknown phenomena while on duty, especially during the heat of the Cold War. Some actually tried engaging the objects in combat. But were any of them bona fide alien aircraft? By examining decades of recently opened government UFO investigations, and interviewing leading experts and pilots who lived through the sightings, we attempt to separate the explainable from the extraterrestrial.
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