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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 …

A green figure discovered in an image taken by the NASA probe Spirit (which landed on Mars in January 2004) has caused international speculation. Some believe it is simply an optical illusion or a rock formation and some that it is evidence of alien life.

Nasa image

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