A well-known conspiracy theory (also seen in The X-Files) attests that aliens are in communication with the U.S. government, providing knowledge and advanced weaponry, or engaged in secret wars with the military.

What Steven Spielberg's new alien movie reveals about our UFO obsessions.

Add Yahoo as a preferred source to see more of our stories on Google. On Friday, we covered the Pentagon’s UFO file drop because a filmmaker first showed the world a spaceship in 1902 (Georges Méliès’ A Trip to the Moon) and, ever since, Hollywood ...