Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...

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

Project Hail Mary, Solaris, and The Hitchhiker's Guide to the Galaxy are all among the very best sci-fi books set in space.

This new group, which is led by Harvard professor Avi Loeb, aims to advise the Trump administration and the U.S. intelligence ...

A NASA astronaut preparing for a grueling eight-month stint in orbit reveals a plan to test for extraterrestrial life.

When Gene Roddenberry created "Star Trek" in the 1960s, he instituted several rules for starship design that are still ...

Get the latest federal technology news delivered to your inbox. You might think this column is about UFOs and the Pentagon's ...

Professor Carol Oliver suggests that time dilation, a cosmic phenomenon, may deter aliens from visiting Earth, as ...

SETI scientists searched the interstellar object 3I/ATLAS for radio signals that could indicate extraterrestrial technology but found nothing beyond human-made interference. Even so, the ...

If you are a believer in visitors from outer space, this is your moment. The feds have declassified UFO files, there is a new documentary on alleged UFO sightings, and, of course, the new Steven ...

Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.