The Mars Exploration Rovers are both near the start of new phases in their missions, even as each has made fresh discoveries. The rover Spirit has encountered what appears to be a new type of rock with unusual chemistry, though scientists last week were still seeking confirmation of their measurements. And Spirit should, within a few weeks, if not sooner, reach a vista point that will require major decisions on how to proceed. Opportunity, on the other side of the planet, started a ...


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