How did Harlow Shapley estimate the size of the Milky Way Galaxy?
Using mathematical equations
With a telescope
Using Cepheid variable stars
With a spaceship
Answer
Harlow Shapley used Cepheid variable stars to estimate the size of the Milky Way Galaxy. Cepheid variable stars are stars whose brightness varies in a regular pattern. By measuring the period of variation in the brightness of Cepheid variable stars, astronomers can determine their distance from Earth. Shapley used Cepheid variable stars to measure the distance to globular clusters, which are spherical collections of stars.
Shining a Light on Harlow Shapley: The Scientist and Advocate Quiz
More Questions
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For how long was Harlow Shapley head of Harvard College Observatory?
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