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In the 1930’s, Fritz Zwicky measured the velocities of galaxies moving in the Coma cluster to...

In the 1930’s, Fritz Zwicky measured the velocities of galaxies moving in the Coma cluster to be ≃ 1000 km/s . The radius of the Coma cluster is ≃ 3 Mpc. Estimate the mass of the Coma cluster. Based on their luminosity, a rough estimate of the mass of stellar material in the cluster is 5×1012 M⊙. What does this mean?

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