A newly identified geological feature on Mars may provide the strongest evidence yet that the Red Planet once hosted a vast, long-lived ocean. Researchers from California Institute of Technology ...

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, ...

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 ...

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 ...

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 ...