Pilot Kenneth Arnold reported seeing nine unidentified flying objects whizzing past Mount Rainier at high speeds from his plane in June 1947, and the terms flying saucer and flying disc were born.

During these military exercises in 1952, various UFO sightings were recorded... but what did those at sea really see?

This is one of the most famous UFO sightings and alien abduction cases in history. Betty and Barney Hill were driving on a rural New Hampshire road one night when a bright light seemed to start ...

Scientists in Mexico are studying a metal orb found in Colombia, which they believe could have extraterrestrial origins, but experts doubt its alien origin.

In 1988, a recently retired U.S. Air Force Office of Special Investigations (OSI) Agent claimed on live television that the ...

But are UFO sightings like this one a sign of extraterrestrial ... performance capabilities,” the report said. “In the long history of claims of extraterrestrial visitors, it is this level ...

Long before Roswell or modern sightings, hundreds of people in Sweden reported seeing a fleet of strange objects flying silently across the sky on May 16, 1808. Witnesses described glowing, spinning, ...

Now, defence analysts are linking an uptick in the region’s long history of alien invasion ... to Arizona’s collection of inexplicable sightings. At least until they’re explained.

A pilot's chilling encounter with 'alien mothership' has resurfaced, with conspiracy theorists calling it one of the greatest cover-ups in US history ... after the 1986 UFO sighting and years ...