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.

Flying discs, metallic orbs, and a mysterious cylinder tumbling past the Apollo spacecraft. Those are just a few of the unidentified anomalous phenomena, or UAP, contained in a batch of government files the Department of Defense released this month.