Check out 5 MORE mysterious UFO sightings that just can’t be explained, in this The Proof Is Out There compilation.

The Pentagon on Friday released a new group of documents and videos related to UFOs, or UAPs, with 72 more documents, images and recordings.

"This is a detective story that can be resolved with better data," Harvard astrophysicist Avi Loeb told Newsweek.

If you're a skeptic, these UFO sightings will convince you that the truth is out there—and it may not be from Earth.

He estimates hundreds of incidents occur annually that baffle military leaders.

The Pentagon on Friday released a third batch of vintage classified files related to “flying saucers” and other unidentified anomalous phenomena — better known to most Americans as unidentified flying ...

Internet-famous UFO stories so wild they may just be true Alien and UFO sightings have been anomalies for decades. While the ...

The latest batch of UFO files from the Pentagon includes artistic renderings by credible witnesses.

Kansas City has long been a hotbed of activity, says Margie Kay, director of the Missouri chapter of the Mutual UFO Network ...

More than 300 pages of intelligence reports from the National Security Agency have shed new light on UFO sightings.

A campaigner is calling on the government to resume investigations into alleged encounters.