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Noun: quasar  'kwey,zaa(r)
  1. A very luminous astronomical object observable to very high redshift (and hence distance from us); thought to be associated with an active galactic nucleus where material merges into a supermassive black hole
    - quasi-stellar radio source, QSO

Derived forms: quasars

Type of: celestial body, heavenly body

Encyclopedia: Quasar, Redshifts and Controversies