The Sun rotates around the center of the Milky Way Galaxy
Chapter 5, Problem 88(choose chapter or problem)
The Sun rotates around the center of the Milky Way Galaxy (Fig. 5-46) at a distance of about 30.000 light-years from the center (l ly = 9.5 X 10l5m). If it takes about 200 million years to make one rotation, estimate the mass of our Galaxy. Assume that the mass distribution of our Galaxy is concentrated mostly in a central uniform sphere. If all the stars had about the mass of our Sun (2 X lO30 kg), how many stars would there be in our Galaxy?
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