This article talks a little bit about exploration on Mars. It's pretty amazing. Three years after both Spirit and Opportunity completed their primary mission, they continue to make new and interesting discoveries. One of Spirit's six wheels no longer turns. As it drags that wheel it churns the soil yielding some exciting discoveries including further signs of ancient water possibly existing on Mars. It's a quick read, and it's pretty impressive to realize that these rovers are still being driven around remotely, on another planet, three years after their planned usefulness. Amazing.
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