Pluto may have a hidden liquid ocean underneath the icy crust. Most likely made up of Ammonia, the ocean was made when another planet hit it, this would explain the slight bulge that keeps it aligned with the Sputnik Planitia. Radioactive heat from the core of Pluto combined with the natural properties of Ammonia keeps this underground ocean liquid. The idea came from cross refrencing telescopes (ground based) and Nasa's New Horizons spacecraft.
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