Footage of an 'alien fortress' on the moon has been dug up by a UFO expert who claims the images are evidence that other life is out there. The pictures, taken from the Lunar Orbiter satellite, appear ...

Are these grainy photographs proof of mysterious, hidden alien structures on Mars? Probably not, but it has not stopped self-proclaimed alien and UFO 'experts' from claiming a series of images taken ...

Get Full Access for Ksh299/Week. Fact-first reporting that puts you at the heart of the newsroom. Subscribe for full access.

A group of researchers have identified at least seven stars that might be surrounded by advanced alien mega-structures known as "dyson spheres." NBC News' Ellison Barber speaks with Janna Levin, a ...