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[18 Feb 2008 | No Comment | 941 supporters]

Like salt used as a preservative, high concentrations of dissolved minerals in the wet, early-Mars environment known from discoveries by NASA’s Opportunity rover may have thwarted any microbes from developing or surviving.
“Not all water is fit to drink,” said Andrew Knoll, a member of the rover science team who is a biologist at Harvard University, Cambridge, Mass.
Opportunity and its twin, Spirit, began their fifth year on Mars last month, far surpassing their prime missions of three months. Today, at a meeting of the American Association for the Advancement of …