Plutos hulk-like Moon Charon: A Possible Ancient Ocean
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Pluto's largest moon may have gotten too big for its own skin. Images from NASA's New Horizons mission suggest that Pluto's moon Charon once had a subsurface ocean that has long since frozen and expanded, pushing outward and causing the moon's surface to stretch and fracture on a massive scale.
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What's eating at Pluto?
Far in the western hemisphere, scientists on NASA's New Horizons mission have discovered what looks like a giant "Bite mark" on Pluto's surface. They suspect it may be caused by a process known as sublimation -- the transition of a substance from a solid to a gas. The methane ice-rich surface on Pluto may be sublimating away into the atmosphere, exposing a layer of water-ice underneath, they report. Ref. Source 9q.
Pluto's polygons may have been formed by convection
On Pluto, icebergs floating in a sea of nitrogen ice are key to a possible explanation of the quilted appearance of the Sputnik Planum region of the dwarf planet's surface. Researchers have proposed that the polygons seen in the images could be individual Rayleigh--Bénard convection cells. Ref. Source 5y.