Hubble found a direct relation between a galaxy's velocity and distance.
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Q25: On average, active galaxies are rare and
Q26: The Tully- Fisher relation allows us to
Q27: Seyfert galaxies are the only type that
Q28: The central engine of an active galaxy
Q29: Quasars appear to have very large redshifts,
Q31: Virtually all galaxies are moving away from
Q32: In the Local Group, most members are
Q33: Quasars can emit thousands of times as
Q34: Emission nebula, such as M42, are much
Q35: Core- dominated radio galaxies and radio galaxies
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