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

Avi Loeb, a Harvard astronomer who has made headlines with his theories about alien encounters, will lead a White House ...

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

From insects to the moon, people have mistaken very Earthly phenomena for UFOs many times.

“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 polarizing Harvard astronomer known for splashy theories about alien visits has been tapped by the White House to lead a team of outside scientists to study the national ...

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