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The sun orbits the center of the Milky Way galaxy (see figure) in a period of...

The sun orbits the center of the Milky Way galaxy (see figure) in a period of 2.5 108 years.

(a) Assuming a circular orbit of radius 2.56 1020 m, compute the mass of the Milky Way.


(b) Estimate the number of stars in the Milky Way, assuming the average star mass equals the mass of the sun—2.0 1030 kg.
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