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.

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

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

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

With new technologies come new opportunities. And that is especially true in astronomy—with every new advanced telescope, we ...

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

Avi Loeb, a distinguished cosmologist who previously led Harvard’s astronomy department until 2020 and conducted extensive ...

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

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 ...

The best way to find alien technosignatures is to look for ones that have long survived their creators, according to a new paper. Reading time 3 minutes In our search for life beyond Earth, we might ...

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