NASA's Curiosity rover found pure sulfur crystals inside a rock after backing over and accidentally crushing it on May 30, ...

This handout image taken by NASA’s Mars rover Curiosity shows rippled patterns on the surface of rocks caused by the waves of a shallow lake billions of years ago ...

Mars once had sprawling river systems that rivaled major watersheds on Earth, and scientists have now identified the biggest ones for the first time. Researchers mapped 16 massive drainage basins ...