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

Scientists suggest that advanced aliens might not have physical bodies, challenging traditional views of extraterrestrial ...

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

The Trump administration has tapped a Harvard professor with controversial theories about aliens to lead a team of scientists ...

Why are we allowing unidentified objects to operate with impunity in our skies?” one expert testified Tuesday.