"Eventually, our own Voyager spacecraft will be extraterrestrial artifacts in other stellar systems." ...

A rare visitor from another star system prompted SETI to hunt for alien technology, but the mysterious object appears to be a ...

Scientists have found a hidden biosphere stretching miles beneath Earth’s surface and as deep as 6 miles below the seafloor.

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

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

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

WASHINGTON (AP) — A polarizing Harvard astronomer known for splashy theories about alien visits has been tapped by the White House to lead a team of outside scientists to study the national security ...

The Great Filter theory suggests advanced civilisations may self-destruct before contacting others, explaining the universe's ...

In 1952, a series of unexplained sightings took place in the skies above Washington. These unidentified objects attracted ...

Scientists in California have completed one of the first dedicated searches for signs of alien technology on 3I/ATLAS, the ...

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

As much as Steven Spielberg likes aliens, he seems to prefer holding them at arm’s length. The creatures in Close Encounters ...