If a Galaxy Is a Member of a Large Cluster

question 6

Multiple Choice

If a galaxy is a member of a large cluster of galaxies,like the Coma cluster,the galaxy would have a typical velocity of 1,000 km/s.If the cluster is 10 Mpc in diameter,how long would it take the galaxy to cross from one side of the cluster to another?

• A) 10,000 years
• B) 10 million years
• C) 100 million years
• D) 10 billion years

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