Pluto may harbour a slushy water ocean beneath its most prominent surface feature, known as the "heart". This could explain why part of the heart-shaped region - called Sputnik Planitia - is locked in alignment with Pluto's largest moon Charon. A viscous ocean beneath the icy crust could have acted as a heavy, irregular mass that rolled Pluto over, so that Sputnik Planitia was facing the moon. The findings are based on data from Nasa's New Horizons spacecraft.
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