A rock containing many smaller round stones could indicate that there was once a large amount of liquid water on the Red Planet.

Captured by the Orbiter's High-Resolution Imaging Science Experiment (HiRISE) camera, the shot was taken on February 28 this ...

The longest molecules ever found on Mars have been unearthed by NASA's Curiosity rover, and they could mean the planet is strewn with evidence for ancient life. Molecule chains containing up to ...