A galaxy has a visible mass of 10 Mo and a flat rotation curve extending to 25 kpc at the level of 150 km s. What is the ratio of its dark-matter mass to its visible mass?
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3 A galaxy has a visible mass of 10 Mo and a flat rotation curve extending to 25 kpc at the level of 150 km s. What is the ratio of its dark-matter mass to its visible mass?
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