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

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

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

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

A video from the US Department of War showing an unidentified object in a canyon has intensified UFO/UAP and alien debates ...

The Pentagon on Friday released a third batch of vintage classified files related to “flying saucers” and other unidentified ...

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

A series of UFO sightings by federal officials in the western US are detailed in striking illustrations made public by the ...

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

Buzz Aldrin is quoted as having made three observations, one of which was of something with a "sizeable dimension." ...

Declassified US government UFO files reveal multiple aerial sightings over India and Nepal in February and March 1968.