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What is the importance of Cepheid variables in astronomy?

ppk

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What is the importance of Cepheid variables in astronomy?

What is the importance of Cepheid variables in astronomy?

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lewis

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Cepheid variables have a period-luminosity relationship that allows us to determine their luminosity from measuring their periodic variations in brightness. Comparing the luminosity with the apparent brightness then gives us the distance to the star. In this way, we can determine distances to not just Cepheid stars but the clusters and even galaxies that they are associated with.

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