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 concealment regarding unidentified flying objects.

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

Jared Isaacman says NASA has captured imagery of unknown objects it cannot explain, as Trump pushes broader UAP declassification efforts forward.

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

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

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 Kentucky using data from the National UFO Reporting Center.