: 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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Stars burn like celestial nuclear fusion reactors, quasars emit thousands of times the luminosity of the Milky Way galaxy, and asteroids slam into planets.
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Andrew Paul, Popular Science, 4 June 2025
Since both quasars and galaxy mergers happened far more often in the Universe’s first few billion years, the astronomers essentially had to look back in time to see them.
—Paul Smaglik, Discover Magazine, 21 May 2025
The best example of the heights such precision can reach may be Gaia’s tour de force determination of the solar system’s acceleration with respect to a vast, sky-encompassing field of quasars.
—Lee Billings, Scientific American, 18 June 2025
The leading candidates included massive galaxies, quasars powered by black holes, and small, low-mass galaxies.
—Sharmila Kuthunur, Space.com, 19 June 2025
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Andrew Paul, Popular Science, 4 June 2025
Since both quasars and galaxy mergers happened far more often in the Universe’s first few billion years, the astronomers essentially had to look back in time to see them.
—Paul Smaglik, Discover Magazine, 21 May 2025
The best example of the heights such precision can reach may be Gaia’s tour de force determination of the solar system’s acceleration with respect to a vast, sky-encompassing field of quasars.
—Lee Billings, Scientific American, 18 June 2025
The leading candidates included massive galaxies, quasars powered by black holes, and small, low-mass galaxies.
—Sharmila Kuthunur, Space.com, 19 June 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 4 Aug. 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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