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

The pilots dubbed the fireballs “foo fighters” but had no idea what they were. Plasma? Enemy tech? Aliens? We still haven’t ...

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

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

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

Optical telescopes have come a long way in the past two-and-a-half centuries — from homemade telescope of William Herschel to ...