Question: A globular cluster with no variable stars would have been left out of Shapley's study because Group of answer choices: the cluster would have been

A globular cluster with no variable stars would have been left out of Shapley's study because Group of answer choices: the cluster would have been too far away. the cluster would have been too young to determine its evolutionary state. the cluster would have been too faint to see. the distance to the cluster could not have been determined

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