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 June 1947, Kenneth Arnold saw something strange in the sky. What he saw sparked a national UFO craze-but it was far from the first time people have reported seeing inexplicable lights in the sky.

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.

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

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

Experts say the videos released by the US government give no evidence of alien technology or extraterrestrial life.

Avi Loeb’s White House panel has asked the Pentagon for videos and files on unexplained aerial sightings ...

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.

The National UFO Reporting Center reports there have been over 2,400 UFO sightings in Tennessee since 1995. Nashville, ...