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1. Pluto's Heart-Shaped Glacier May be the Result of a Subsurface Ocean: https://www.space.com/heart-shaped-glacier-pluto-subsurface-ocean.html 2. NASA's New Horizons Reveals Unexpectedly Complex Atmosphere on Pluto: https://www.space.com/nasa-new-horizons-complex-atmosphere-pluto.html 3. Pluto's Surface is Surprisingly Varied and Colorful: https://www.space.com/pluto-surface-varied-colorful-photos.html 4. Mysterious Mountains on Pluto May be the Result of a Refrozen Ocean: https://www.space.com/mysterious-mountains-pluto-refrozen-ocean.html 5. Pluto's Icy Heart is Actually Two Separate Glaciers: https://www.space.com/pluto-icy-heart-two-glaciers.html 6. Video: Stunning Flyby of Pluto Reveals Vast Icy Plains: https://www.space.com/pluto-flyby-video-stunning-icy-plains.html
Foreign material delivered as a giant impact can dominate large portions of icy dwarf planets, according to impact simulations. This may explain the peculiar shape and location of the Sputnik Planitia region on Pluto, without the need for a present-day subsurface ocean.
Pluto and other large bodies in the Kuiper Belt are surprisingly rich in rock rather than ice. It may be because the early solar system consisted of much more carbon than previously thought, a new study suggests.