Add Yahoo as a preferred source to see more of our stories on Google. This mosaic of images from the Mast Camera (Mastcam) instrument on NASA's Curiosity Mars rover shows a series of sedimentary ...

Add Yahoo as a preferred source to see more of our stories on Google. A view from the "Kimberley" formation on Mars taken by NASA's Curiosity rover. One-third of the red planet might have once been ...

Billions of years ago, water flowed across Mars. Most scientists agree the red planet had rivers. But did those rivers flow into an ocean? New research from the University of Arkansas found strong ...

In the new study, the researchers focused on Coprates Chasma, which is in the southeastern portion of the Valles Marineris canyon system. They used high-resolution images from the orbiters to examine ...

Mars may have once had an ocean so vast that it covered one-third of the planet before evaporating billions of years ago and leaving behind a telltale sign: a flat band of land, outlining the former ...

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A primitive ocean on Mars held more water than Earth’s Arctic Ocean, and covered a greater portion of the planet’s surface than the Atlantic Ocean does on Earth, according to new results published ...

Mars may have once held a vast ocean across its northern lowlands, and the clearest clue may not be the faint shoreline traces scientists have argued over for years. Instead, it could be a broad, ...