The Tully- Fisher relation allows us to determine the distance to the most distant galaxies.
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Q21: Active galaxies emit most of their radiation
Q22: Space itself is expanding.
Q23: While our Magellanic Clouds are irregulars, the
Q24: Quasars are the brightest objects in the
Q25: On average, active galaxies are rare and
Q27: Seyfert galaxies are the only type that
Q28: The central engine of an active galaxy
Q29: Quasars appear to have very large redshifts,
Q30: Hubble found a direct relation between a
Q31: Virtually all galaxies are moving away from
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