Naming of moons underworld, and Nix (a respelling of Nyx), mother of Charon, is the goddess of darkness and the night. Kerberos is a giant three-headed dog who guards the entrance to the underworld. The fifth moon is named for the river Styx that forms the boundary between the worlds of the living and the dead. The name of Eris's moon Dysnomia was suggested by its discoverer Michael E. Brown, who also suggested the name of the dwarf planet. The name has two meanings: in mythology Dysnomia (lawlessness) is the daughter of Eris (chaos). However, the name is also an intentional reference to
Dragons in Greek mythology where it became the constellation Draco. Dragons in Greek mythology Dragons play a significant role in Greek mythology. The word dragon derives from the Greek δράκων (drakōn) and its Latin cognate draco. Ancient Greeks applied the term to large, constricting snakes. Daniel Ogden speaks of three ways to explain the origins of Greek dragon myths: as "vertical" evolution from (reconstructed) Proto-Indo-European mythology, as "horizontal" adaptation from Ancient Near Eastern mythology, or as sitting within "the cloud of international folktale". Regarding theories of vertical transmission, Ogden argues that they carry "an unspoken assumption that prior to such a transfer the Greeks'