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

In June 1947, Kenneth Arnold saw something strange in the sky. What he saw sparked a national UFO craze-but it was far from ...

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

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

In fact, throughout history there have been numerous reports of supposed alien spacecraft sightings that have turned out to ...

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

From the Navy’s infamous Tic-Tac encounter to thousands of recent reports, believers say some of the strangest UFOs may be hiding underwater.

Mike Miller is the executive editor on the movies team at Entertainment Weekly. He previously worked as a writer-reporter for PEOPLE and TMZ.

If you're a skeptic, these UFO sightings will convince you that the truth is out there—and it may not be from Earth. Eerie UFO sightings we can’t 100% explain Everyone has an opinion when it comes to ...

An audio tape reportedly exists of a UFO briefing between Air Force officials and scientists in 1952.

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 ...