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

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

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

A 1948 secret military report and reports of UFO activity at nuclear missile sites suggest a history of government ...

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

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

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

Sean Stone says the U.S. government reverse-engineered craft in the Roswell crash.

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

The volume includes 40 new files, including 19 videos.

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

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