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

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

Astronomers believe that the supermassive black holes at the centers of galaxies actually power quasars. Ashley Strickland, CNN, "'Cold quasar' discovery could signal galaxies' 'retirement party' phase," 12 June 2019 Eclipses continued to corroborate Einstein’s predictions for decades, eventually eclipsed (so to speak) by the advent of quasar observations. Devin Powell, Discover Magazine, "How the 1919 Solar Eclipse Made Einstein the World's Most Famous Scientist," 24 May 2019 Meanwhile, pressure from the swirling material would squeeze matter and energy out the poles of the doughnut, making the characteristic jet that radio astronomers can see erupting from the hearts of many galaxies and quasars. Dennis Overbye, New York Times, "Black Hole Drags Star to Dusty Death," 14 June 2018 The underlying method of Terenzi's work is close to radio astronomy, which observes distant quasars, galaxies, black holes, and stars by tuning into their radio frequency and listening for the radiation signatures an object emits. John Wenz, Popular Mechanics, "Meet the Astronomer Who Listens to the Music of the Cosmos," 12 May 2015 These objects are called quasars, or active galactic nuclei. Elizabeth Howell, Space.com, "The Stuff Falling into This Black Hole Is Moving at Almost 56,000 Miles a Second!," 25 Sep. 2018 The galaxies surround a quasar, or highly active supermassive black hole. James Rogers, Fox News, "Sprawling galaxy cluster discovered 'hiding in plain sight'," 17 Aug. 2018 Blazars are versions of a quasar, a supermassive black hole at the center of a galaxy that's actually feeding on matter. John Timmer, Ars Technica, "Supermassive black hole shot a neutrino straight at Earth," 12 July 2018 In fact, this finding already shows that astronomers have overlooked bright and distant quasars hiding in plain sight. Harmeet Kaur, CNN, "Astronomers have found the fastest-growing black hole ever seen, and it's got a monster appetite," 16 May 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

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11 Jul 2019

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The first known use of quasar was in 1964

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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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appealing forcibly to the mind or reason

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