Was There Flowing Water on Mars?

On September 27, 2012, NASA scientists announced that the Curiosity rover found direct evidence for an ancient streambed in Gale Crater, suggesting an ancient "vigorous flow" of water on Mars. In particular, analysis of the now dry streambed indicated that the water ran at 3.3 km/h (0.92 m/s), possibly at hip-depth.

When did Mars have flowing water?

There is plenty of evidence of water on Mars' surface in the distant past – about four billion years ago. At that time, liquid water flowed in great streams and stagnated in the form of pools or lakes, such as in the Jezero crater explored by the Perseverance rover, in search of traces of past life.

Is there any water at all on Mars?

Mars is dry, alright—or at least it appears to be. But the researchers say much of its water—from 30% to a staggering 99% of it—is still there. It simply retreated into the martian rocks and clay rather than escaping into space.