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The dwarf planet Eris has a moon called Dysnomia, which is muchsmaller in mass than Eris. If Dysnomia has an orbital period of 16days and

The dwarf planet Eris has a moon called Dysnomia, which is muchsmaller in mass than Eris. If Dysnomia has an orbital period of 16days and orbits Eris at a distance of 40,000 km, then what is themass of Eris?

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