Drones, and autonomous helicopters in particular, seem to be quite the buzzing technology these days. But could they be headed to Mars, too? Engineers have gotten pretty good at putting rovers on Mars -- and making them so they last a long, long time. As of this weekend, the Opportunity rover has outlived its primary mission length by 44 times. But one of the reasons that longevity is so critical? Mars has rocky, uneven terrain. It takes a long time for a wheeled rover to traverse a...
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