Scientists are calling for a lunar quarantine facility where samples from Mars, the Moon, and beyond would be examined before being brought to Earth. They warn that even a tiny alien microorganism ...

Thousands of people have reported UFOs or alien encounters in Northern California. That number could soon go up.

With the release of Disclosure Day, Steven Spielberg’s new film about aliens, a question as old as science fiction itself resurfaces: if aliens were to arrive on Earth, would they come to conquer us, ...

The findings of a new study may help "explain some of the radio silence we’ve seen in technosignature searches" for alien signals, an astronomer said.

On July 11, 1979, the abandoned U.S. space station Skylab made a spectacular return to Earth as it burned up in the ...