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Quasi Stellar Objects: Quasars and Active Galaxies
Quasar Host Galaxies
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Hubble Space Telescope image courtesy of STScI ...
QSO - Quasi Stellar Object, also Quasar: QSOs are objects that, at first glance, appear as normal stars. Upon closer inspection, however, QSOs have very large redshifts (i.e.
Later, when it was found that most objects of the kind do not show radio emission and are mainly detected in the visible part of the spectrum, they started to be called simply "quasi stellar objects, ...
 See also: Quasar, Light, Earth, Galaxies, Temperature
  
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