Pluto is a dwarf planet in the Solar System near the Kuiper Belt and it was also named after Hades, the ancient Greek and Roman god of the Underworld.

As a ice-cold rocky planet that has been a few blocks away from the Sun, Pluto has five moons called Charon, Styx, Nix, Kerberos, and Hydra.  Charon, the largest of the five moons, is mutually tidally locked with Pluto, and it is massive enough to pull the system's barycenter outside of Pluto and thus Pluto–Charon is sometimes considered a double planet.