?The Big BangDistances to local galaxies are determined by measuring the brightness of
Chapter 11, Problem 25(choose chapter or problem)
The Big Bang
Distances to local galaxies are determined by measuring the brightness of stars, called Cepheid variables, that can be observed individually and that have absolute brightnesses at a standard distance that are well known. Explain how the measured brightness would vary with distance, as compared with the absolute brightness.
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