Which of the Following Statements About Rich Clusters of Galaxies

question 3

Multiple Choice

Which of the following statements about rich clusters of galaxies (those with thousands of galaxies) is not true?

• A)They are sources of X-ray emission due to the presence of hot,intergalactic gas.
• B)There likely have been numerous collisions among the member galaxies at some time in the past.
• C)Galaxies in the central regions are predominantly spirals,while elliptical galaxies roam the outskirts.
• D)They often have a very large,central dominant galaxy near their center,perhaps formed by the merger of several individual galaxies.
• E)The speeds of the galaxies in the cluster indicate that most of the cluster mass is dark matter.

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