orbit whence satellites can accrete. The giant-impact model has also been applied to explain the origin of other dwarf planet satellite systems, including Eris's moon Dysnomia, Orcus's moon Vanth, and Haumea's ring and two moons. In contrast to regular moon systems of the giant planets, giant impacts can give rise satellites that are unusually massive in proportion to their parent planets; Charon's mass ratio to Pluto is roughly 0.12, while Earth's Moon is the fifth most massive moon in the solar system.

Regular moons may also originate