Answer: The Sun revolves around the center of the Milky

Chapter 5, Problem 84GP

(choose chapter or problem)

The Sun revolves around the center of the Milky Way Galaxy (Fig. 5–49) at a distance of about 30,000 light-years from the center (\(1\ \mathrm{ly}=9.5\times10^{15}\mathrm{\ m}\)). If it takes about 200 million years to make one revolution, 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 (\(2\times10^{30}\mathrm{\ kg}\)), how many stars would there be in our Galaxy?

Equation Transcription:

Text Transcription:

1 ly =9.5x10^{15} m

2x10^{30} kg

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