This annotated image of Pluto's Sputnik Planum region identifies what appears to be flows of exotic nitrogen ice on the surface of the dwarf planet. NASA's New Horizons spacecraft took this image of ．．． 較多This annotated image of Pluto's Sputnik Planum region identifies what appears to be flows of exotic nitrogen ice on the surface of the dwarf planet. NASA's New Horizons spacecraft took this image of Pluto during a flyby on July 14, 2015. 較少
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