You have measured the angular diameter of a galaxy. What information do you need to determine its actual diameter?

Name: You have measured the angular diameter of a galaxy. What information do you need to determine its actual diameter?
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Question

Quizplus · Accepted Answer

To determine the actual diameter of a galaxy from its angular diameter, you need to know its distance from us. The angular diameter alone does not provide information about the actual size without knowing how far away the object is.

You Have Measured the Angular Diameter of a Galaxy