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Cephid variable stars

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Explain why Cephid variable stars are so useful for determining the distances of galaxies.

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The expert explains why Cephid variable stars are so useful for determining the distances of galaxies.

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Cepheid variable star is usually a giant yellow star which has regular periods of expanding and contracting. This in turn causes regular oscillations in its luminosity.

The ratio between the star's luminosity and the star period is quite ...

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