How did Harlow Shapley avoid the bias of dust when measuring the size and shape of the Milky Way?

Name: How did Harlow Shapley avoid the bias of dust when measuring the size and shape of the Milky Way?
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Harlow Shapley used globular clusters as a reference point to measure the size and shape of the Milky Way. Globular clusters are located outside the disk of the Milky Way, so they are not affected by the dust that is present in the disk.

How Did Harlow Shapley Avoid the Bias of Dust When