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The upper slopes of the highest peaks are coated with a bright material that contrasts sharply with the dark red color of the surrounding plains.
Scientists think this bright material could be predominantly methane that has condensed as ice onto the peaks from Pluto's atmosphere. "That this material coats only the upper slopes of the peaks suggests methane ice may act like water in Earth's atmosphere, condensing as frost at high altitude," said John Stansberry, a New Horizons science team member from Space Telescope Science Institute, Baltimore, Maryland.