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Aging Mars rover finds signs of water: rocks reveal ancient aquatic environment hospitable to life.
Ancient Mars may have been a friendlier place for life than scientists once suspected. The veteran Mars rover Opportunity has dug up evidence that groundwater flowed near a giant crater called Endeavour about 4 billion years ago.
And like the ancient lake that rookie rover Curiosity recently explored at Gale Crater (SN Online: 3/12/13), the water at Endeavour was just right for microbial life: not too acidic or salty for cells to thrive, researchers report in the...
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