A tale of two oceans | Scienceline
New Horizons's successor, a future probe to Pluto, could help look under Pluto's surface, at a subsurface ocean -- one that does not exist on Pluto's moon Charon
The SETI Institute
Scientists hypothesize that, like Pluto’s, Charon’s ocean would have been made of a mixture of water and other chemicals — in particular, ammonia. When Charon first formed, it would have been warm enough to be liquid.