If the dark matter in the Milky Way were composed entirely of MACHOS (evidence shows it is
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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 stars of average mass 1.5 times the Sun's mass.
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