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Variable stars such as Cepheid variables are used in what important measurement in astronomy?

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Variable stars such as Cepheid variables are used in what important measurement in astronomy?

Variable stars such as Cepheid variables are used in what important measurement in astronomy?
A)   The measurement of the distances to stars
B)   The measurement of the rotation speeds of galaxies
C)   The measurement of the surface temperatures of stars
D)   The keeping of accurate time

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Discovering the Universe

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

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