Researchers find mysterious aztec codices in Mexico City. See more in this clip from Season 21, Episode 7, "Mysteries of the Aztecs." ...

Newly released Pentagon files have allegedly confirmed that one of the most famous UFO incidents in history was real.

Learn more about interstellar travel and what it would look like to travel to Proxima Centauri.

Tom Skerritt, the prolific, award-winning actor known for his roles in "M*A*S*H," "Alien," "Top Gun," and "Picket Fences," ...

Tom Skerritt, the Emmy-winning actor who embodied a solid, wry authority figure, whether as a flight instructor in “Top Gun,” a tough-but-fair sheriff on TV’s “Picket Fences” ...

Billionaire Eric Schmidt spent 12-hour days coordinating teams as Google CEO. Now, he says, AI could eliminate thousands of ...

A dead alien infant, an intergalactic royal family and a spaceship crashing into Earth turn director Na Hong-jin’s monster ...

A mysterious truck is rolling onto Kent State campus, and students brave enough to venture inside will soon find themselves transported to an alien ...

"Star Wars" is home to aliens of all shapes and sizes — but behind all the CGI, they're 100% human. Here's what some of your ...

A mysterious creature captured in camera-trap images near the US-Mexico border has sparked speculation after UFO investigator Jaime Maussan claimed it could be an unknown predator unlike any commonly ...

An eerie sighting over Washington DC has sparked wild claims that aliens are hiding in America's skies. A recent image ...