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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