The vast plain, informally named Sputnik Planum within Pluto’s ‘heart' is host to a mysterious phenomenon of 'floating' hills. Images from Pluto suggest that the mountains are composed of water ice floating on denser nitrogen-dominated ice and move like icebergs in the Atlantic Ocean.
As they flow along convection movements, they accumulate in a feature informally named Challenger Colles – honoring the crew of the lost space shuttle.
http://www.nasa.gov/feature/pluto-s-mysterious-floating-hills
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