16. On Feb. 25, 1942, a large, dark object over the Los Angeles coastline was mistaken for a Japanese attack and drew a barrage of anti-aircraft fire. Memos to President Roosevelt confirmed the existence of unidentified aerial objects.
17. UFOs were often seen and photographed during NASA's space missions in the 1960s.
18. UFO sightings have been claimed by former President Jimmy Carter, Clyde Tombaough (the astronomer who discovered Pluto) and William Shatner (who claims to have been rescued by aliens who pointed him in the right direction when he was lost in the Mojave Desert).
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