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An astronomical unit (AU) is defined as the mean distance from the earth to the sun, or 1.50x10^11 m. The dwarf planet Eris was discovered

An astronomical unit (AU) is defined as the mean distance from the earth to the sun, or 1.50x10^11 m. The dwarf planet Eris was discovered in 2005 orbiting 96.6 AU from the Sun, about 3 times as far out as Pluto. What is the mean speed of orbit for Eris?

 

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