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Amazing Space Photos

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Color World

This undated handout photo provided by NASA, taken earlier this month by the Messenger space probe, shows a portion of Mercury. Earth's first nearly full look at Mercury reveals that the tiny lifeless planet took a far greater role in in shaping itself than scientists had thought with volcanoes spewing "mysterious dark blue material." New images from NASA's Messenger space probe should help settle a decades-old debate about what caused parts of Mercury to be somewhat smoother than it should be. NASA released photos Wednesday Oct. 29, 2008 from Messenger's fly-by earlier this month, that gave the answer: Lots of volcanic activity, far more than signs from an earlier probe.

(AP Photo/NASA)

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