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Charon
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Charon is Pluto's only known satellite.
It is named for the mythological figure who ferried the dead across the River Styx into Hades (the underworld). Charon was discovered in 1978 by Jim Christy. Prior to that it was thought that Pluto was much larger since the images of Charon and Pluto were blurred together.
Charon is unusual in that it is the largest moon with respect to its primary planet in the Solar System. Some prefer to think of Pluto/Charon as a double planet rather than a planet and a moon.
Charon's mass, density, and radius is not well known. It's composition is also unknown, but it's low density (about 2 gm/cm3) indicates that it may be similar to Saturn's icy moons. It's surface seems to be covered with water and ice. Interestingly, this is quite different from Pluto.
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