Mars once had sprawling river systems that rivaled major watersheds on Earth, and scientists have now identified the biggest ...

In the new research, Goudz and his team combined decades of data from Mars orbiters with ancient maps of valleys, lake beds, and streams. Much of this information came from NASA's Mars Odyssey ...

Billions of years ago, Mars was not the arid, desolate planet we know today. Evidence suggests that rainfall once flowed across its surface, carving valleys, filling craters, and forming river ...

Ancient Mars is coming into sharper focus as a planet laced with rivers, deltas and vast drainage basins, and that new map of its watery past is rapidly reshaping where scientists intend to look for ...