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Why is absolute magnitude important with regard to Cepheid variables?

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The absolute magnitude of a few Cepheids is required to infer absolute, rather than merely relative, distances. These absolute magnitudes were measured by a statistical study of the proper motions of Cepheids within our own galaxy.

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Similar questions: How is absolute magnitude of Cepheid variables measured? What kind of distance can be measured with known absolute magnitude of Cepheid variables? How is absolute magnitude of Cepheid variables used to determine distance? [ Hide these questions ]

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