NASA addresses the release of UFO files and discusses the ongoing search for life on Mars. What are they hiding?

The Pentagon released over a hundred newly declassified files related to UFOs (now officially referred to as Unidentified ...

Neil deGrasse Tyson joined Piers Morgan for a wide-ranging debate about UFO files, Trump, alien life, AI, NASA, and the ...

The interstellar comet emitted methane, a potential biosignature, as it passed the sun, physicist Avi Loeb says.

"This is a detective story that can be resolved with better data," Harvard astrophysicist Avi Loeb told Newsweek.

An audio tape reportedly exists of a UFO briefing between Air Force officials and scientists in 1952.

The NASA Swift space observatory is in danger of falling from space after 22 years, but a rescue mission with the help of a ...

There’s no data to suggest that aliens exist. However, if we believed they existed and came to Earth, our planet would offer ...

NBC News’ Gadi Schwartz previews the new exhibit at the California Science Center, where visitors will soon be able to view ...

An interstellar comet that passed through the Solar System last year may be up to 12 billion years old – far older than the ...

Astrobiologists think extraterrestrial civilisations grow so much that they hit crisis points, missing the chance to set out ...