Two Galaxy Clusters Have Identical Radii,but the Galaxies in Cluster

question 40

Multiple Choice

Two galaxy clusters have identical radii,but the galaxies in cluster A have a typical orbital velocity of 700 km/s,while the galaxies in cluster B have a typical velocity of 1,400 km/s.How do the masses of these clusters compare to each other?

• A) Cluster B is half as massive as cluster A.
• B) Cluster B is twice as massive as cluster A.
• C) Cluster B is four times as massive as cluster A.
• D) Cluster B is eight times as massive as cluster A.

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