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FILE - This composite image provided by NASA shows before and-after images taken by the Opportunity rover. At left is an image of a patch of ground taken on Dec. 26, 2013. At right is in image taken on Jan. 8, 2014 showing a rock shaped like a jelly doughnut that had not been there before. Researchers have determined this now-infamous Martian rock resembling a jelly doughnut, dubbed Pinnacle Island, is a piece of a larger rock broken and moved by the wheel of NASA's Mars Exploration Rover Opportunity in early January. Opportunity landed on Mars in 2004 and continues to explore. (AP Photo/NASA)

FILE - This composite image provided by NASA shows before and-after images taken by the Opportunity rover. At left is an image of a patch of ground taken on Dec. 26, 2013. At right is in image taken on Jan. 8, 2014 showing a rock shaped like a jelly doughnut that had not been there before. Researchers have determined this now-infamous Martian rock resembling a jelly doughnut, dubbed Pinnacle Island, is a piece of a larger rock broken and moved by the wheel of NASA's Mars Exploration Rover Opportunity in early January. Opportunity landed on Mars in 2004 and continues to explore. (AP Photo/NASA)

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