Powder from inside a “mudstone” that was the first rock on another planet ever drilled for samples demonstrates that Mars was once habitable, confirming what planetary scientists have long suspected. The gray powder drilled from a sedimentary rock on the floor of Gale Crater, where the nuclear-powered Curiosity rover has been exploring since landing there last summer, was analyzed by a pair of robotic chemistry labs inside the rover body. They found sulfur, nitrogen, hydrogen, oxygen, ...

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