Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

President Donald Trump made a jaw dropping jibe when he was allegedly briefed on alien “hybrids” living among humans.

Having considered more than 1,000 cases, this analyst of unidentified anomalous phenomena has honed a rational process for ...

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.