The tests also revealed that the ditches only develop on dunes with very fine, evenly sized sand grains. Coarser or more ...

Blocks of carbon dioxide ice appear to carve mysterious gullies on Mars as they melt down dune slopes and blast away sand.

"Our work is a new piece of evidence that suggests that Mars was once a much more complex and active planet than it is now." ...

For years, scientists have been looking for signs of liquid water just beneath the surface of Mars. The problem, though, is that the observations from various orbiting probes have been maddeningly ...

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 ...

For decades, scientists have theorized about how Mars reached its current state. Many believe that the Red Planet's surface may have once been covered in rivers and oceans. But, if that's really the ...

Mars, once thought too cold and dry for liquid water, may briefly host salty brines twice a day during certain seasons. These fleeting bursts wouldn’t be enough to sustain humans, but they could have ...

Our friends at the UA Lunar and Planetary Lab’s HiRISE camera are in the headlines today: “I’m going to hear from my colleagues: ‘So, you’ve discovered water on Mars for the thousandth time?’ ” says ...

New research using NASA’s Perseverance rover has uncovered strong evidence that Mars’ Jezero Crater experienced multiple episodes of fluid activity — each with conditions that could have supported ...