This photo shows a 68-mile-diameter crater (large indentation at center) in the north polar region of Mercury, which - thanks to measurements by the Messenger spacecraft - has been shown to harbor frozen water. Scientists made the announcement Thursday, Nov. 29, 2012. (AP Photo/NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)
Read the article: Spacecraft confirms that closest planet to sun, Mercury, harbors ice
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