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How do you measure the distance to a cepheid?

April 26, 2017cepheid distance measure

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How do you measure the distance to a cepheid?

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That’s where the Cepheid variable stars come in. The period, or time between maximum brilliance points, is very nearly correlated with the absolute luminosity. It’s difficult to know what the luminosity of a star is, if you don’t know how far away it is, but the period is EASY to measure.