Which One of These Statements About Clusters of Galaxies Is

question 28

Multiple Choice

Which one of these statements about clusters of galaxies is true?

• A) The observed mass of the galaxies of the cluster is many thousands of times too small to hold the cluster together.
• B) The observed mass of the galaxies of the cluster is about 10 times larger than the amount needed to hold the cluster together.
• C) The observed mass of the galaxies in the cluster is about 10 times too small to hold the cluster together.
• D) The observed mass of the galaxies of the cluster is almost exactly equal to the mass needed to hold the cluster together.

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