Three billion years ago, you could have stood on Mars and watched a river spill into a sea. That picture is still speculative ...

Ancient shoreline features hint that water on Mars once formed a vast ocean.

"The structures that we were able to identify in the images are clearly the mouth of a river into an ocean." The post ...

Even though the Red Planet's atmosphere is thin, wind is still one of Mars' most relentless sculptors.

Long before Mars turned into the frozen desert you see today, water shaped its surface in dramatic ways. Rivers cut through highlands, lakes pooled inside craters, and floods tore open canyon walls.

What can mapped drainage systems on Mars teach scientists about the red planet's watery past? This is what a recent study published in the Proceedings of the National Academy of Sciences hopes to ...