Cepheid variable stars are important because we can use them to determine the distance to any stellar group that contains some of these stars.

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Cepheid variable stars have a periodicity in their brightness that is related to their intrinsic luminosity. By measuring the period of the brightness variations and comparing it to the observed brightness, we can determine the distance to the star. This makes them an important tool for measuring distances to other galaxies or stellar groups that contain Cepheid variable stars.

Cepheid Variable Stars Are Important Because We Can Use Them