Strange interstellar comet speculated to be alien spacecraft is older than Solar System - Scientists say comet represents ...

From the Greys to the Nordics, these aliens appear frequently across abduction stories and science fiction tales.

A polarizing Harvard astronomer known for splashy theories about alien visits has been tapped by the Trump administration to ...

A striking optical illusion resembling a floating city or alien spacecraft was captured on camera above the countryside in ...

Take a drive to the CIA’s Area 51 – a route with more UFO sightings and unexplained mysteries than anywhere else on Earth ...

“Disclosure” has become a cult word. It shouldn't be, since all it means, technically, is to reveal something. But the new wave of alien conspiracy theorists have made “disclosure” into a teasingly ...

Jordan Flowers claims Russia and China may be reverse-engineering alien technology, raising national security concerns.

Steven Spielberg's claims that aliens have already visited Earth have drawn a mixed but pointed scientists' reaction this week, with astrophysicists in the UK and Australia stressing that while ...

A look at 10 of the greatest alien sci-fi movies, from Ridley Scott's Alien to Denis Villeneuve's Arrival, none by Steven ...

Grain-sized remnants of alien technology may get caught in solar wind and land on plants and moons close to us ...