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.

On windswept dunes inside Martian craters, such as Matara and Russell, the Red Planet wears a curious pattern that has long ...

According to new research, the answer is far more unusual — and has nothing to do with life. Instead, the gullies appear to ...

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 ...

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 ...