qua·​sar | \ ˈkwā-ˌzär How to pronounce quasar (audio) also -ˌsär \

Definition of quasar

: a region at the center of a galaxy that produces an extremely large amount of radiation

Examples of quasar in a Sentence

Recent Examples on the Web To rectify that oversight, Stern and Walton noted that the Keck Observatory had made several observations of the quasar between 1997 and 2007. Jennifer Ouellette, Ars Technica, "Astronomers have finally measured the distance of first observed Einstein ring," 8 June 2020 By using quasars, the team hoped to overcome the observing bias faced by previous studies. Nola Taylor Redd, Scientific American, "Astronomers Get Earliest Ever Glimpse of Ancient Giant Galaxy," 20 May 2020 Astronomers have no trouble understanding how black holes — objects so dense that not even light can escape the tombstone grip of their gravity — can become the most luminous objects in the universe, powering quasars. Dennis Overbye, New York Times, "A Black Hole’s Boomerangs," 14 May 2020 Paradoxically, belching black holes are the brightest objects in the universe, producing the fireworks known as quasars and other violent phenomena. Dennis Overbye, New York Times, "This Black Hole Blew a Hole in the Cosmos," 6 Mar. 2020 Some astronomers believe there are two quasars at the center of the galaxy. Fox News, "Molecular oxygen discovered in another galaxy for first time ever," 20 Feb. 2020 But Chandra sees everything in X-rays, which can tell astronomers more information about high-energy objects like black holes and quasars. Avery Thompson, Popular Mechanics, "Another NASA Space Telescope Has Gone Offline," 12 Oct. 2018 These tiny delays depend on the distribution of mass within the lens and the distances between us, the quasar, and the lens. Michael Greshko, National Geographic, "The universe might be acting weird. Cosmic 'lenses' may help reveal why.," 12 Sep. 2019 He and his team began searching for the WHIM by studying its effects on the light from distant quasars. Quanta Magazine, "A Short History of the Missing Universe," 19 Sep. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'quasar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of quasar

1964, in the meaning defined above

History and Etymology for quasar


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The first known use of quasar was in 1964

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Last Updated

20 Jun 2020

Cite this Entry

“Quasar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quasar. Accessed 8 Aug. 2020.

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More Definitions for quasar


How to pronounce quasar (audio)

English Language Learners Definition of quasar

astronomy : a very bright object in space that is similar to a star and that is very far away from the Earth and gives off powerful radio waves

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More from Merriam-Webster on quasar

Thesaurus: All synonyms and antonyms for quasar

Rhyming Dictionary: Words that rhyme with quasar

Britannica.com: Encyclopedia article about quasar

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