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

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

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

Why do we tend to assume that UFOs are crafts carrying alien beings rather than alien beings themselves? How the UFO ...

Researchers say it’s impossible to reach conclusions about UFO videos because information has been redacted.

A new federal release is giving the public another look at unexplained sightings. The Department of War released its third batch of declassified UFO and Unidentified Anomalous Phenomena records on ...

The volume includes 40 new files, including 19 videos.

The incident, reportedly over a nuclear weapons assembly plant, was included in the Pentagon’s fourth tranche of UFO files.

NASA's relationship with UFOs has evolved alongside broader changes in public and government interest in unexplained sightings.

Pilot Kenneth Arnold took flight from Chehalis, Washington in his single-engine airplane, looking for a missing military ...

Stacker compiled a ranking of cities with the most UFO sightings in Colorado using data from the National UFO Reporting Center.

National attention on UFOs has shifted in recent years, especially after the US government in the past decade has released reports about them.