The Sun, which is 2.2 $ 1020 m from the center of the

Chapter , Problem 47

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The Sun, which is 2.2 $ 1020 m from the center of the Milky Way galaxy, revolves around that center once every 2.5 $ 108 years. Assuming each star in the Galaxy has a mass equal to the Suns mass of 2.0 $ 1030 kg, the stars are distributed uniformly in a sphere about the galactic center, and the Sun is at the edge of that sphere, estimate the number of stars in the Galaxy.

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