Mars

Scientists are rethinking a long-held belief that the liquid responsible for shaping Mars' surface must have been water.

Warmth on sunny days could be a major trigger for instigating dust storm activity on Mars.

We may be racing against the clock to identify signs of life on Mars — and it's all because of cosmic rays.

A new theory proposes that Phobos and Deimos resulted from the wreckage of a larger asteroid that wandered too close to Mars and was ripped apart.

Was alien life in "hot water" on Mars billions of years ago? New evidence from the Martian meteorite "Black Beauty" suggests so.

The Curiosity shows sulfur stones, with no explanation of how they occurred on the Martian surface.

"We think the water came from the melting of nearby sub-surface ice called permafrost, and that the permafrost melting was caused by magmatic activity that still occurs periodically on Mars to the present day."

Data from China's Zhurong rover has revealed what appears to be an ancient shoreline streaking through Mars' northern hemisphere.

Huge shells of frozen carbon dioxide at Mars' south polar cap resulted in subsurface meltwater, which fed a huge system of rivers, lakes and even a sea, a new study suggests.