Mountain sides of large water-ice blocks, varying from dark to light and some possibly revealing layers of Pluto crust, squeezed together to create the "al-Idrisi mountains." The tumultuous terrain ends suddenly at the nearly level and lightly textured soft, nitrogen-rich ices of "Sputnik Planum." [Find out more about Pluto.]
(Image: © NASA/JHUAPL/SwRI)
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