Assume that an average globular cluster is 25 pc in diameter. If you observe a galaxy that contains globular clusters that are 9 arc seconds in diameter, how far away is the galaxy? (Hint: Use the small-angle formula)

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Assume that an average globular cluster is 25 pc in diameter. If you observe a galaxy that contains globular clusters that are 9 arc seconds in diameter, how far away is the galaxy? (Hint: Use the small-angle formula). 

 

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