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Mar 18, 2007，Based on new data, scientists have estimated that the amount of water trapped in frozen layers over Mars' south polar region is enough to cover the entire planet in a liquid layer about 1...
New Evidence of Water on Mars（图）
Water Mars
2007/3/7
March 2, 2007，NASA has released new detailed images that provide further evidence that water once flowed beneath the martian surface. Photos taken by Mars Reconnaissance Orbiter of Candor Chasma, one ...