Researchers have found new evidence for a massive subsurface ocean on Mars, again raising the possibility of microbial life.

The “Mars ocean theory” has long been the topic of discussion among scientists and cartographers due to Mars’s geography, which suggests a large northern ocean once existed on its surface.

"Shorelines are great locations to look for evidence of past life." Today, Mars is a chilly desert of rock and dust — but 4 billion years ago, the planet had rivers, lakes and even oceans with sandy ...

Mars might hold enough subsurface water to cover its surface in a global ocean between 0.62 to 1.24 miles (1 to 2 kilometers) ...

Mars was once home not only to an ocean but "vacation-style" beaches with sun, sand and softly lapping waves, new findings suggest. Researchers now believe that the planet was covered in a huge oc ...

The discovery, they say, is the strongest evidence yet that Mars's northern lowlands once sported an ocean that covered a third of the planet's surface—and which could have provided a habitable ...

when Mars was a warmer and wetter place than it is today. We named the ancient ocean Deuteronilus — which, I assume, is named after Deuteronomy, the fifth book in the Torah in which Moses ...