what evidence is there that galaxies contain dark matter? Supermassive black holes?

Stars and Galaxies (MindTap Course List)
10th Edition
ISBN:9781337399944
Author:Michael A. Seeds
Publisher:Michael A. Seeds
Chapter17: Active Galaxies And Supermassive Black Holes
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what evidence is there that galaxies contain dark matter? Supermassive black holes?
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