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St. Paul, Minn.

Friday Follow: The quest for Mars

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Mars
This approximate true-color image was taken by the Mars Exploration Rover 'Spirit.' It shows a rock outcrop dubbed Longhorn, and behind it, the sweeping plains of Gusev Crater.
Photo by HO/AFP/Getty Images
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Mars
This approximate true-color image was taken by the Mars Exploration Rover 'Spirit.' It shows a rock outcrop dubbed Longhorn, and behind it, the sweeping plains of Gusev Crater.
Photo by HO/AFP/Getty Images