Many people assosiate this term with aliens oflr spaceships. It can certain to any unknown object seen in ths atmosphere.
But sightings of extraondinary lights been documented foe thousand of years. One of that earliest sightings was in the fifhteen century BCE. In Egyp.
In 1947, a man named Kenneth Arnold recounted seeing "nine silvery circular object" he eventually wrote a book he describe about UFO.
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