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.

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

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

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

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

Ross Coulthart speculates SpaceX employees could be read into secret UFO programs.

"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 ...

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

There are a lot of documentaries about UFOs that don't devolve into sensationalist conspiracy theories. These are the best ones.