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Required information A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 47,000 ly (light-years) from the galactic

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Required information A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 47,000 ly (light-years) from the galactic center and has a speed of 275 km/s. The total visible mass (i.e., matter we can detect via electromagnetic radiation) of the galaxy is 10 solar masses. What fraction of the total mass of the galaxy is visible, according to this estimate

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