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34.4 Exercise 5

Avg difficulty 2.5

If the dark matter in the Milky Way were composed entirely of MACHOs (evidence shows it is not), approximately how many would there have to be? Assume the average mass of a MACHO is 1/1000 that of the Sun, and that dark matter has a mass 10 times that of the luminous Milky Way galaxy with its 1011\text{10}^{\text{11}} stars of average mass 1.5 times the Sun’s mass.

OpenStax College Physics 2e, 34.4 Dark Matter and Closure, exercise 5

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.