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
The Dog in the Manger The Dog in the Manger The story and metaphor of The Dog in the Manger derives from an old Greek fable which has been transmitted in several different versions. Interpreted variously over the centuries, the metaphor is now used to speak of one who spitefully prevents others from having something for which one has no use. Although the story was ascribed to Aesop's Fables in the 15th century, there is no ancient source that does so. The short form of the fable as cited by Laura Gibbs is: "There was a dog lying in a manger who did not eat