Close-up of Pluto's Heart (IMAGE)

Washington University in St. Louis

Close-up of Pluto's Heart

Caption

Close-up of Sputnik Planum shows the slowly overturning cells of nitrogen ice. Boulders of water ice and methane debris (red) that have broken off hills surrounding the heart have collected at the boundaries of the cells.

Credit

NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

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