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George Francis Fitzgerald is best known for? Group of answer choices Discovering the period -luminosity relationship of Cepheid variables Calculating the distribution of galaxies close

George Francis Fitzgerald is best known for? Group of answer choices Discovering the period -luminosity relationship of Cepheid variables Calculating the distribution of galaxies close to the Milky Way Computing the distances to Globular clusters Discovering that distance is not an absolute quantity Measuring the speed of light using spectroscopy

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