What Is a Quasar? - Sky & Telescope - Sky & Telescope
https://skyandtelescope.org/astronomy-resources/what-is-a-quasar/
WebSep 28, 2021 · A quasar is a supermassive black hole feeding on gas at the center of a distant galaxy. Quasar is short for quasi-stellar radio source, because astronomers first discovered quasars in 1963 as objects that looked like stars but emitted radio waves. Now, the term is a catch-all for all feeding, and therefore luminous supermassive black holes ...
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