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.

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

Trump administration science advisors are offering conventional explanations for some of the sightings of mysterious orbs of ...

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

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

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

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

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

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

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

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