Dysnomia is a moon of which body?

• A. Haumea
• B. Eris
• C. Pluto
• D. Makemake

Answer: (B)

Dysnomia is the small moon that orbits Eris, one of the largest dwarf planets in the Kuiper belt. The connection is specific: Dysnomia accompanies Eris, not Haumea, Makemake, or Pluto. Each of those bodies has its own moons—Haumea’s moons, Makemake’s moon, and Pluto’s family of moons—but Dysnomia is unique to Eris. The name Dysnomia comes from Greek myth, the daughter of Nyx, chosen to echo the disorder-associated naming theme of Eris. Recognizing which moon belongs to which body helps you recall the correct pairing in this question.