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Mars
This approximate true-color image obtained from NASA on August 19, 2004, taken by the Mars Exploration Rover 'Spirit' 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 obtained from NASA on August 19, 2004, taken by the Mars Exploration Rover 'Spirit' shows a rock outcrop dubbed "Longhorn," and behind it, the sweeping plains of Gusev Crater.
Photo by HO/AFP/Getty Images