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now the very terrain came to be remained a mystery for the distant work planet which is an average surface temperature of minus three hundred eighty degrees Fahrenheit scientists suspect several processes of work including depredation of volatile isis Rebecca Pluto lightly still have enough internal heat for geological activity left over four point five billion years after its formation , relatively young mountains west of Sputnik planum and mounts to the south are harder to explain scientist believe both rest on blocks of water I know how that came to exist on Pluto is unknown