The heart on the planet Pluto has a frozen surface but also has evidence that shows that there might me an ocean 60 miles deep. After finding that Pluto was ocean locked with it's largest moon, scientists were trying to find the reason behind this. The heart shape on Pluto was where a meteor hit way long ago, but then the planets core bounced back to level out both sides(isostatic compensation) and filled the core with nitrogen ice. But for the planets side to be locked with the moon it requires a much larger mass which they believe is a super salty ocean.
Wietering, Hanneke, "Plutos 'Heart' Hints At Deep, Underground Ocean", Space.com 23 September, 2016. http://www.space.com/34179-plutos-heart-hints-at-deep-underground-ocean.html
It's amazing how much is left that we haven't discovered. Each day we learn something new about the world around us. I wonder if we will ever be able to actually reach this ocean, or if we even reach pluto.
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