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

In early 2008, residents in and around the small central Texas town of Stephenville experienced something unexplainable: UFO ...

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

Steven Spielberg's 1977 classic tapped into anxieties about the US government hiding UFO information from the public. It ...

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

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

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

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

After seeing Steven Spielberg's "Disclosure Day," check out these real-life accounts of strange aerial sightings.

Christopher Mellon, a former high-ranking official in the U.S. Defense Department, says U.S. military leaders are baffled by ...

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

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