New evidence of ancient rivers suggests Mars may have been a "blue planet," thanks to an ocean spanning its entire northern ...

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

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

Mars today is a frozen, dusty desert. But if you look deep inside Valles Marineris, the largest canyon system on Mars and in ...

Mars, now a dusty world of rusted rock and thin air, once carried enough water to transform its face into something far more familiar. New mapping of ancient river systems indicates that a vast ...

MARS was not always the beaming red we’re so used to seeing in space. Scientists have revealed that it was actually a “blue ...

Using images from cameras on Mars orbiters, an international research team has discovered structures on Mars that are very similar to classic river deltas on Earth. These are traces of rivers that ...

Seismic data collected by NASA suggests the amount of water hidden in the red planet's crust would cover its surface in a global ocean. Evidence is mounting that a secret lies beneath the dusty red ...

NASA's Curiosity rover has captured the first close-up images of a part of Mars that scientists say provide evidence of how water once flowed on the red planet. There were once rivers, lakes and ...

Mars had an Arctic-sized ocean, and scientists are only now beginning to see the outline of it. For a long time, the planet has been described as dry and stripped of anything familiar. Yet images ...

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