Alarmed defense experts believe these UFOs may be highly advanced, next-generation spy drones, raising concerns about American technology being outstripped by previously unknown foreign adversaries, and a sighting above Syria – in skies heavily contested by the U.S., Russia, China and Iran – has only added to the angst.

A mysterious object speeding across the universe might look like a UFO, but the real story is even more fascinating. Scientists have discovered a supermassive black hole unleashing powerful winds at incredible speeds from a distant galaxy.

The Pentagon has released another batch of ‘UFO Files’ with footage of unknown objects in the sky—here are the most common alien theories, explained. This voice experience is generated by AI. Learn more.

Americans "deserve the truth," a U.S. congressman has told a press conference as part of a wider transparency campaign.

Newly declassified Pentagon UFO files have reignited debate over a possible alien presence on the Moon after a previously secret NASA Apollo 16 briefing surfaced online. The recording references a mysterious "big hole" near the Van de Graaff crater and includes a startling remark that it "could be an alien star base.

Given the unique importance of a potential UFO visit, confirmation requires a high standard of evidence. Here are simple tips for your inevitable close encounters with UFO claims.

No bombshells so far in the latest Pentagon batch of declassified Unidentified Anomalous Phenomena files. But they show the CIA hid its involvement.

Dr. Hal Puthoff claims the U.S. has recovered remains of four separate species of alien life from UFOs, citing people involved in the recoveries.

Astrophysicist Neil deGrasse Tyson has renewed calls for greater government transparency on alleged extraterrestrial evidence. He is certain that the public is more than prepared to confront proof of alien life should it exist.