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12 years ago
Why can the Tully-Fisher relation be used at greater distances than Cepheids? 
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12 years ago
We must image the individual star and follow its light curve for the period-luminosity relation of Cepheids, but the Tully-Fisher relation depends on the light of the galaxy having its spectral lines broadened by the galaxy's spin; this can be detected from far larger distances than single star images can. 
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