Size of Pluto compared to the Earth The Moons of Pluto Pluto has 5 known moons. In order of distance from Pluto, these are Charon, Styx, Nix, Kerberos and Hydra. Charon is the largest of the moons and mutually tidally locked with Pluto. This is a gravitational lock that makes one side of an astronomical … Continue reading Pluto Facts