qua·​sar | \ ˈkwā-ˌzär 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

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 And looks of this kind are pretty rare, the quasar's discoverers said. Fox News, "Superbright quasar could shed light on universe's youth," 10 July 2018 Our complex universe—chock full of galaxies, black holes and quasars—didn’t just appear after the Big Bang. Jason Daley, Smithsonian, "Astronomers Find Signature From the Universe’s Earliest Known Stars," 22 May 2018 Blazars, like quasars, are distant cosmic beacons powered by supermassive black holes, which generate intense radiation and fire jets of particles from their poles. Daniel Clery, Science | AAAS, "Ghostly particle caught in polar ice ushers in new way to look at the universe," 12 July 2018 The scientists used the European Space Agency’s XMM-Newton X-ray space telescope to study the BL Lacertae quasar 1ES 1553+113, an active, supermassive black hole at the center of a galaxy. Amina Khan, latimes.com, "After years of searching, scientists can finally account for all the normal matter in the universe," 20 June 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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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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to express emotion in a dramatic way

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