Galaxies are labeled as active if there is an unusually large amount of star formation occurring in their centers.
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Q80: The blue color seen in some galaxies
Q81: Most galaxies have remained the same type
Q82: A spiral galaxy is the result of
Q83: Galactic cannibalism is the capture of the
Q84: Active galactic nuclei is a term used
Q86: The only evidence that astronomers have supporting
Q87: Astronomers believe that the reason some quasars
Q88: Gravitational lenses formed by galaxy clusters can
Q89: A quasar is a strong X-ray pulsar
Q90: In radio galaxies, the main source of
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