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Scientists Probe Mystery of Pluto's Icy Heart

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Pluto's "heart," or Sputnik Planitia

This high-resolution image captured by NASAs New Horizons spacecraft shows the bright expanse of the western lobe of Plutos heart, or Sputnik Planitia, which is rich in nitrogen, carbon monoxide and methane ices.


Scientists are offering several new scenarios to explain the formation of Pluto's frozen heart-shaped feature, first spotted by NASA's New Horizons spacecraft in 2015.

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