Harvard astrophysicist Avi Loeb argues 3I/ATLAS and other interstellar objects may hint at alien technology, drawing fame, ...

The strangely shaped object - snapped by NASA's Opportunity rover - has resurfaced and reignited wild theories about little green men on the Red Planet ...

NBC News' Gadi Schwartz talks to NASA program manager Carlos García-Galán about the moon base initiative and the agency's ...

An unusual sighting in a NASA image has reignited speculation that something extraterrestrial once existed on Mars.

The Harvard astrophysicist has devoted years—and thousands of interviews—to the idea that mysterious objects streaking ...

NASA is racing to save its Swift telescope from falling back to Earth with a daring rescue mission. The salvage effort gets ...

A rare visitor from another star system prompted SETI to hunt for alien technology, but the mysterious object appears to be a ...

The planet Mars is home to many wonders waiting to be discovered by humans in the coming years. Experts recently discovered ...

An interstellar comet that blazed past the sun and swung by Earth last year could be nearly three times older than our solar ...

Neil deGrasse Tyson calls on the government to just show the alien, saying Americans are ready for disclosure after years of hearings and UAP files.

The Pentagon's latest release of declassified Unidentified Anomalous Phenomena files places a spotlight on reports and recordings from the Northeastern United States, including two videos documenting ...

A new federal release is giving the public another look at unexplained sightings.The Department of War released its third batch of declassified UFO and Unidentified Anomalous Phenomena records on ...