If you're into UFOs, today is a special day. On June 24, 1947 the UFO phenomenon all started when pilot Ken Arnold reported that he saw discs or "flying saucers" over Mt. Rainier in the state of Washington.

Here's the full story, according to history.com:

"On June 24, 1947, the civilian pilot Kenneth Arnold reported seeing nine objects, glowing bright blue-white, flying in a “V” formation over Washington’s Mount Rainier. He estimated the objects’ flight speed at 1700 mph and compared their motion to “a saucer if you skip it across water.” (In newspaper reports of Arnold’s sighting, this description was mistakenly taken to mean that the objects were shaped like saucers, leading to the popularization of the term “flying saucer” as a synonym for UFO.) Though Arnold said he initially thought what he had seen were test flights of military aircraft, the military later said they had been conducting no test flights during the time of the incident. A prospector on Mt. Adams saw the objects at around the same time as Arnold, bolstering his story."

Watch this video for more on Ken Arnold's sighting:

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