in Greek mythology, the son of Erebus and Nyx (Night), whose duty it was to ferry over the Rivers Styx and Acheron those souls of the deceased who had received the rites of burial. In payment he received the coin that was placed in the mouth of the corpse. In art, where he was first depicted in an Attic vase dating from about 500 BC, Charon was represented as a morose and grisly old man. Charon appears in Aristophanes' comedy Frogs (406 BC); Virgil portrayed him in Aeneid, Book VI (1st century BC); and he is a common character in the dialogues of Lucian (2nd century AD). In Etruscan mythology he was known as Charun and appeared as a death demon, armed with a hammer. Eventually he came to be regarded as the image of death and of the world below. As such he survives in Charos, or Charontas, the angel of death in modern Greek folklore.

No spacecraft has yet visited Pluto and Charon; all information about this distant system has come from observations made from the vicinity of Earth. Spectral analysis of light reflected from Charon reveals that its surface is covered primarily by water ice, a sharp contrast to the frozen methane that is so prevalent on Pluto. The relatively low reflectivity of Charon (average albedo about 0.35) suggests that other, darker materials such as cometary dust must be present. Since the 1990s Pluto and Charon have come to be regarded as giant members of the Kuiper belt, a ring of icy, cometary objects that lies beyond Neptune's orbit.