The images that recently have gone viral actually date back to 2001.

There's more evidence that water once flowed on Mars with the discovery of an ancient river delta deep below the surface.

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

The new film probes the possibility of alien life – here's how the science of Project Hail Mary stacks up.