This video breaks down why K2-18b has suddenly become one of the most important planets in the search for life beyond Earth.

Astronomers have recently started looking for black holes bigger than galaxies. Brian Lacki explains how these “stupendously ...

The “Wow!” signal is one of our best pieces of evidence for aliens, but researchers are building a compelling case for a more ...

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

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

This is the story of a mysterious finding in New Hampshire, pieced together from the incident summary sheet and official ...