: a region at the center of a galaxy that produces an extremely large amount of radiation
Examples of quasar in a Sentence
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Gravitational lensing occurs when a massive object sits between Earth and a background source — in this case, RXJ1131-1231 and its quasar.
—
Robert Lea, Space.com, 27 Aug. 2025
As such, quasars are among the most powerful beacons astronomers can use to probe distant regions of the universe.
—Lee Billings, Scientific American, 18 June 2025
Stars burn like celestial nuclear fusion reactors, quasars emit thousands of times the luminosity of the Milky Way galaxy, and asteroids slam into planets.
—Andrew Paul, Popular Science, 4 June 2025
Related article Largest celestial object of its kind discovered in the distant universe
Highly dynamic, luminous quasars are rare, according to NASA.
—Kameryn Griesser, CNN Money, 23 May 2025
See All Example Sentences for quasar
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Robert Lea, Space.com, 27 Aug. 2025
As such, quasars are among the most powerful beacons astronomers can use to probe distant regions of the universe.
—Lee Billings, Scientific American, 18 June 2025
Stars burn like celestial nuclear fusion reactors, quasars emit thousands of times the luminosity of the Milky Way galaxy, and asteroids slam into planets.
—Andrew Paul, Popular Science, 4 June 2025
Related article Largest celestial object of its kind discovered in the distant universe
Highly dynamic, luminous quasars are rare, according to NASA.
—Kameryn Griesser, CNN Money, 23 May 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 9 Sep. 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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