Quasar - Wikipedia, the free encyclopedia:
"Quasi-stellar radio sources ("quasars", /ˈkweɪzɑr/) are the most energetic and distant members of a class of objects called active galactic nuclei (AGN). Quasars are extremely luminous and were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light, that appeared to be similar to stars, rather than extended sources similar to galaxies. Their spectra contain very broad emission lines, unlike any known from stars, hence the name "quasi-stellar"."
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