Mars' massive Mount Sharp may have formed billions of years ago as water carried sand and silt into the center of a large crater. ASA/JPL-Caltech/MSSS Mars is cold and dry, but billions of years ago, it was cold and wet. That's according to new evidence from NASA's Curiosity rover , which is currently exploring a large crater on Mars. The rover has found geological evidence that lakes of liquid water existed in the crater 3.5 billion years ago. "The lakes may have existed for hundreds of thousands of years," says John Grotzinger , a researcher at Caltech and chief scientist for the rover. But he adds, the lake network may have stuck around for millions of years. This is the second big water announcement NASA has made about Mars recently. Last week, the space agency revealed evidence that salty, liquid water still flowed in small amounts on the surface. Rocks on the surface of Mars suggest that liquid water pooled on the surface and remain...
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