Spacecraft orbiting the Red Planet have helped researchers map out an ancient coastline that surrounded a large ocean ...

Mars may have once possessed an ocean at least as large as Earth's Arctic Ocean, a new study suggests. Previous research ...

The Mars Express orbiter launched to the Red Planet. Twenty years later, ESA has delivered a high resolution color image of ...

Mars is famous for its volcanoes, canyons and ancient river valleys, but some of its most active geology happens in slow ...

Mars today is a frozen, dusty desert. But if you look deep inside Valles Marineris, the largest canyon system on Mars and in ...

For nearly two decades, the Mars Reconnaissance Orbiter has captured ultra-high-definition images of Valles Marineris, Mars’ massive canyon system. Stretching over 4,000 km and plunging 7 km deep, it ...