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scitechdaily.com
Astronomy & Astrophysics 101: Quasar
What Is a Quasar? A quasar is an extremely active and luminous type of active galactic nucleus (AGN). While all quasars are AGNs, not all AGNs are quasars. Quasars are a subclass of active galactic nuclei (AGNs), extremely luminous galactic cores where gas and dust falling into a supermassive bl
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