Which Method Did Harlow Shapley Use to Find the Distance

question 34

Multiple Choice

Which method did Harlow Shapley use to find the distance to a few of the nearest Cepheid variables?

• A) He measured their proper motions across the sky.
• B) He used the period-luminosity relation.
• C) He measured their parallax.
• D) He measured their spectroscopic parallax.

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