This image provided by NASA, shows a image NASA’s Messenger probe made when it flew by Mercury in September 2009. It's a close-up of its pockmarked southern hemisphere, an area that had never been seen before. Messenger will enter into Mercury’s orbit on March 17, 2011. Earth is about to get better acquainted with its oddball planetary cousin. (AP Photo/NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)
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