You Observe Two Galaxy Clusters, Cluster a and Cluster B

question 75

Multiple Choice

You observe two galaxy clusters, cluster A and cluster B.If the outer galaxies of both clusters have the same circular velocities, but cluster A has twice the mass of cluster B, then the size of cluster A must be

• A) 4 times that of cluster B.
• B) one-fourth that of cluster B.
• C) twice that of cluster B.
• D) half that of cluster B.
• E) the same as cluster B.

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