Pluto is Odd

(Slate::Bad Astronomy) – Phil Plait:

This shot shows hundreds of pits in Sputnik Planum, the “atrium and ventricle” of the famous heart-shaped region. This huge area is probably a depression on the surface filled with frozen nitrogen, which may have flowed into the lowlands like a glacier, smoothing it over. …

bad_astronomy/2015/10/17/pluto

Pluto sublimation pits

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