It has been estimated that there may be up to 1 trillion metric tons of water ice on Mercury. MErcury Surface, Space ENvironment, GEochemistry and Ranging spacecraft have confirmed a long-held hypothesis that Mercury harbors abundant water ice and other frozen volatile materials in its permanently-shadowed polar craters. The full November 29, 2012 NASA HQ press conference on science at planet Mercury lasts 53-minutes. More from NASA and The New York Times.
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