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

question 16

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) It is impossible to determine the clusters' relative distances with only this information.

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Definitions:

Limbs

The arms and legs of a human or the analogous appendages in other animals, used for movement and manipulation.

Digits

The numbers from 0 to 9 used in counting and calculations, and also refer to the fingers and toes in humans.

Movement

The action or process of moving or being moved, pertinent to physical processes and mechanics within biological systems.

Glabrous Skin

Areas of the skin that are naturally hairless, such as the palms of the hands and the soles of the feet.