In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.

The history of astronomical discovery shows that many of the most detectable phenomena, especially detection firsts, are not ...

(cokada/iStock/Getty Images) Alien megastructures built to harvest stellar energy or alter the orbits of stars may be ...

Scientists have uncovered a surprising way to study the harsh space weather around young M dwarf stars. Mysterious dips in starlight turned out to be massive rings of plasma swirling in the stars’ ...

A strange purple object aboard the ISS sparked alien fears online, but NASA revealed it was a potato experiment. It shows how microgravity can turn ordinary plants into bizarre shapes.

Movies like "Disclosure Day" and "Project Hail Mary" renew our fascination with extraterrestrials and the idea that humankind ...

“They’re not extraterrestrials. They’re dolls made from animal bones from this planet joined together with modern synthetic ...

Debunking alien claims matters, but so does telling richer, more compelling stories about how humans shaped their own past.

A strange, tentacled object that went viral online was revealed to be a space-grown purple potato. Astronaut Don Pettit cultivated the unusual specimen during a microgravity gardening experiment, ...

Aliens did not visit Earth in the distant past. They didn't build the pyramids or rule ancient Greece from Mount Olympus or teach Mesoamericans how to plant corn. How do I know? Because they didn't do ...

Trump has ordered a UFO data release. But if aliens exist, what would they think of us? - For generations, human beings have ...