"The surfaces of Nix and Hydra are as close to unaltered as you can get."

Pluto's dwarf planet partner Charon may have spilled its guts to create 2 of the pair's moons

Source: space
Source Link: https://www.space.com/astronomy/pluto/plutos-dwarf-planet-partner-charon-may-have-spilled-its-guts-to-create-2-of-the-pairs-moons