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Question
Find the approximate mass of the luminous matter in the Milky Way galaxy, given it has approximately $10^{11}$ stars of average mass 1.5 times that of our Sun.
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$3\times 10^{41} \textrm{ ly}$
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OpenStax College Physics for AP® Courses Solution, Chapter 34, Problem 1 (Problems & Exercises) (0:31)

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