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UFOs? Are they visitors from another world? Where have famous sightings happened? Although people have claimed to see strange objects in the sky for much of human history, UFO is a fairly new term. It’s an acronym (a word formed from the initial letters of a set of words) that stands for Unidentified Flying Object. The term first appeared in the 1950s, and up until then these weird objects were known by another name: flying saucers. This is because many of the sightings described floating, disc-shaped ob
