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Wow.

Pluto has these, too. But they're made of nitrogen ice instead of water ice, and the mountains are made of water ice instead of rock. https://t.co/vrkn6EA8Vh

— Emily Lakdawalla (@elakdawalla) July 18, 2017

via Twitter https://twitter.com/elakdawalla

July 18, 2017 at 10:01PM