Add Yahoo as a preferred source to see more of our stories on Google. Sep. 16—From a person who staged UFO hoaxes with friends as a teenager to a U.S. Navy radar operator who spotted about 100 objects ...

Reverse engineering alien spacecraft: A French 'flying saucer' aircraft, the Couzinet Aerodyne, is modeled after the suspected UFOs spotted in the 1950s. (Photo by Keystone/Hulton Archive/Getty Images ...

Recently revealed documents, smuggled out of Russia, disclose the Soviets' extensive investigations into thousands of ...