A galaxy cluster is measured to have a radius of 8 x10¹⁹ km, and the small outer galaxies are measured to orbit the cluster center with a circular velocity of 900 km/s.What is the mass of this cluster's core? (Recall that G = 6.67 *10^-11 N m² kg^-2.)

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The Answer of A galaxy cluster is measured to have a radius of 8 x10¹⁹ km, and the small outer galaxies are measured to orbit the cluster center with a circular velocity of 900 km/s.What is the mass of this cluster's core? (Recall that G = 6.67 *10^-11 N m² kg^-2.)

A Galaxy Cluster Is Measured to Have a Radius of 8