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.

The north pole of Mars is slowly sinking under the weight of an ice cap that only formed within the past few million years. And, in the process, it's telling us something about what the planet's ...

Our new understanding of the ever-changing topography of Mars came into full focus in the last week with the release of three scientific papers and dozens of images by the University of Arizona's ...

If you've ever looked at Mars through a telescope, you probably noticed its two polar ice caps. The northern one is made largely of water ice—the most obvious sign that Mars was once a wetter, warmer ...

Mars is by far the most Earth-like planet in the solar system… but that's not saying much. We know that Mars once hosted oceans, rivers, lakes, streams. It had a thick, carbon-dioxide-rich atmosphere.

Multiple plans exist to explore Mars in the coming decades using robotic and crewed missions. The ultimate goal of these missions is to determine whether human beings could live there someday. This ...

Scientists have captured rare insights into Mars’s north polar vortex, where temperatures plunge far below those outside its boundaries and darkness triggers an unusual surge in ozone. New observation ...