By Comparing Globular Clusters, You Find That Cluster A's RR

question 24

Multiple Choice

By comparing globular clusters, you find that Cluster A's RR Lyrae stars are 100 times fainter than Cluster B's RR Lyrae stars. You know that both clusters have approximately the same chemical composition and age, and thus their RR Lyrae stars should have the same luminosities. Which is true about the clusters' distances?

• A) Cluster A is 10 times farther away than Cluster B.
• B) Cluster A is 10 times closer to us than Cluster B.
• C) Clusters A and B are approximately the same distances from us.
• D) Cluster A is 100 times farther away than Cluster B.
• E) Cluster A is 100 times closer to us than Cluster B.

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