: a region at the center of a galaxy that produces an extremely large amount of radiation
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The observations also contain a small sample of quasars, the bright hearts of active galaxies powered by feeding supermassive black holes, which, because of their incredible luminosity, can be seen even further away.
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Robert Lea, Space.com, 19 Mar. 2025
Perhaps the gamma rays were produced in events that gave rise to the radio outbursts of quasars.
—Mark Fischetti, Scientific American, 17 Mar. 2025
Studies of quasars also have plenty more to say, notes Simcoe of MIT, who wrote with colleagues about quasars in the early universe in the 2023 Annual Review of Astronomy and Astrophysics.
—The Editors, JSTOR Daily, 30 Jan. 2025
The luminous cores of distant, ancient galaxies, quasars expel jets of energetic matter.
—Ashley Strickland, CNN, 13 Feb. 2025
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Robert Lea, Space.com, 19 Mar. 2025
Perhaps the gamma rays were produced in events that gave rise to the radio outbursts of quasars.
—Mark Fischetti, Scientific American, 17 Mar. 2025
Studies of quasars also have plenty more to say, notes Simcoe of MIT, who wrote with colleagues about quasars in the early universe in the 2023 Annual Review of Astronomy and Astrophysics.
—The Editors, JSTOR Daily, 30 Jan. 2025
The luminous cores of distant, ancient galaxies, quasars expel jets of energetic matter.
—Ashley Strickland, CNN, 13 Feb. 2025
See All Example Sentences for quasar
Cite this Entry
“Quasar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quasar. Accessed 1 Apr. 2025.
Copy CitationKids Definition
quasar
noun
qua·sar
ˈkwā-ˌzär 
also -ˌsär
: any of the very distant starlike heavenly objects that give off very strong blue and ultraviolet light and powerful radio waves
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