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Estimate how long a galaxy in the Coma cluster would take to travel from one side of the cluster to the other. Assume that

Estimate how long a galaxy in the Coma cluster would take to travel from one side of the cluster to the other. Assume that the galaxy moves with a constant speed equal to the cluster's radial velocity dispersion. How does this compare with the Hubble time, t#? What can you conclude about whether the galaxies in the Coma cluster are gravitationally bound?

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