UFOs aren’t new. Indeed, humans have been describing unidentified flying objects for millennia, with depictions of disk-like objects and unusual atmospheric objects found in the art and literature of ancient civilizations from the Sumerians and the Egyptians to the Greeks and Romans.
But the modern era of UFOs took off in the middle of the 20th century, right around the time rockets and high-tech aircraft were being devised, often in secret. Coincidence? Paranoia? Perhaps. In any event, these seven UFO sightings gained a lot of attention—and raised a lot of eyebrows.