Posted: Nov 17, 2016 12:17 am
by DougC

B.B.C. Article
Pluto 'has slushy ocean' below surface
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.
The space probe flew by the dwarf planet in July 2015 and is now headed into the Kuiper Belt, an icy region of the Solar System beyond Neptune's orbit.
Sputnik Planitia is a circular region in the heart's left "ventricle" and is aligned almost exactly opposite Charon. In addition, Pluto and Charon are tidally locked, which results in Pluto and Charon always showing the same face to each other.