Scientists using images from NASA's Mars Reconnaissance Orbiter, or MRO, have estimated that the planet is bombarded by more than 200 small asteroids or bits of comets per year forming craters at least 12.8 feet (3.9 meters) across.
Mars may be experiencing plate tectonics - a phenomenon previously thought to be confined to Earth.
NASA's Mars Reconnaissance Orbiter (MRO) has revealed that sand dunes on Mars can put on a surprising turn of speed.
A Martian dust devil approximately 12 miles high (20 kilometers) was spotted whirling its way along the Amazonis Planitia region of Northern Mars just a few weeks ago.
NASA has released the first Mars pictures commissioned by the public - and there's not a thumbprint or double exposure among them.