Mars has a lot of rocks. In fact, Mars has so many rocks that have undergone all sorts of weathering over the eons that, ...

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 is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a cold, desert world within our solar system. It has a very thin atmosphere, but ...