Mars Reconnaissance Orbiter Homepage

Caltech researchers used the Mars Reconnaissance Orbiter to determine that surface water left salt minerals behind as recently as 2 billion years ago. READ MORE

Seasons change even on Mars and NASA's fleet of explorers are helping scientists learn more about the effects on the Red Planet. WATCH VIDEO

Scientists found evidence that a region of northern Mars called Arabia Terra experienced thousands of "super eruptions," the biggest volcanic eruptions known, over a 500-million-year period. READ MORE

Three studies published in the past month have cast doubt on the premise of subsurface lakes below the Martian south pole. READ MORE