The Manhattan-sized interstellar visitor hurtling through space has captured the imaginations of UFO watchers for months and ...

A theory as to why we haven't heard from aliens which renowned theoretical physicist and cosmologist Stephen Hawking agreed with has resurfaced online. Planet Earth is about the size of a speck of ...

Steven Spielberg's eerie 'Disclosure Day' trailer has ignited alien theories online. Is it hinting at hidden extraterrestrial ...

Giorgio A. Tsoukalos talks about the Alien Astronaut Theory & the new episodes of "Ancient Aliens" on The History Channel.