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Solar System Exploration
Planets
Eris: Moons
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Color image of fuzzy Kuiper Belt Object Eris and its Moon
Scientists used Eris' moon Dysnomia to estimate its size.

Dysnomia is the only known moon of dwarf planet Eris. It, and other small moons around planets and dwarf planets, allow astronomers to calculate the mass of the parent body. Dysnomia plays a role in determining how comparable Pluto and Eris are to each other.

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Last Updated: 6 Mar 2014