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Martian leaks: Hints of present-day water

In some of the coldest regions on Mars, water appears to have recently gushed from just beneath the surface, running down crater walls and steep valleys. Those startling findings, based on an analysis of images taken by a high-resolution camera aboard NASA's Mars Global Surveyor spacecraft, could radically revise the way scientists think about Mars and profoundly affect where and how they will search for life on the Red Planet.

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