Jordan Flowers claims Russia and China may be reverse-engineering alien technology, raising national security concerns.

This video ranks extreme stellar objects by how likely they are to host life or support advanced alien civilizations.

"Project Hail Mary" really pushes the limit when it comes to non-humanoid aliens. But researchers posit that real aliens ...

Stacker compiled a collection of 70 images that show how the '70s changed the world. See photos of the decade's defining ...