Pluto's ocean is super salty, scientists say
View larger. | from NASA New Horizons The spacecraft captured this view of Sputnik Planicia when it passed near Pluto on July 14, 2015. The large ice-filled basin forms the western half of the famous heart formation on Pluto. Fractures and bulges on Sputnik Planitia indicate that Pluto's ocean beneath the surface is slightly denser