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

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

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

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