Liquid ocean on Pluto

Using a thermal evolution model for Pluto updated with data from NASA’s New Horizons mission, researchers hope that the dwarf planet might have  or had at one time a liquid ocean beneath its icy crust. The study, led by a PhD student Noah Hammond, found if Pluto’s ocean had frozen into oblivion millions or billions of years ago, it would have caused the entire planet to shrink. But there are no signs of a global contraction to be found on surface. On the contrary, New Horizons showed signs that Pluto has been expanding.

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