Eris: Most Massive Dwarf Planet (Fact of the Day)

Eris and Dysnomia (to the left of Eris)
Eris is the the most massive dwarf planet known. It is the ninth massive object to orbit Sun directly. It has a diameter of about 2,300 km which is about the same as Pluto and about 27% more massive than Pluto. It has one known moon which is Dysnomia. It is about 96.6 AU away from the Sun, which is about 3 times that of Pluto. It has an orbital period of 557 Earth years.




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