• A compact, extremely bright celestial object whose power output can be hundreds to several thousand times that of the entire Milky Way galaxy. Quasars are among the most distant objects in the universe and are generally considered to be a form of active galactic nucleus.
  • An <xref>extragalactic</xref> object, <xref>starlike</xref> in appearance, that is among the most <xref>luminous</xref> and thought to be the most distant objects in the <xref>universe</xref>.
  • a starlike object that may send out radio waves and other forms of energy; many have large red shifts
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