It's a familiar and intriguing story: A strange craft appears in the sky, performs seemingly otherworldly aerobatics, baffles onlookers, and then is gone as quickly as it appeared, leaving us to question our eyesight and sanity.
But the reality is, many foreign things seen in the sky — also known as unidentified flying objects, or UFOs — are revealed to be anything but extra-terrestrial. Most of these sightings turn out to be experimental planes, atmospheric phenomena, or merely everyday objects that slip from our hands and head skyward.
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