quasar

[ kwey-zahr, -zer, -sahr, -ser ]

/ ˈkweɪ zɑr, -zər, -sɑr, -sər /

noun Astronomy.

one of over a thousand known extragalactic objects, starlike in appearance and having spectra with characteristically large redshifts, that are thought to be the most distant and most luminous objects in the universe.

Also called quasi-stellar object.

Origin of quasar

1960–65; quas(i-stell)ar, in quasi-stellar radio source, the first type of quasar discovered

Words nearby quasar

quartz-iodine lamp, quartzite, quartz lamp, quartz movement, quartz plate, quasar, quasars, quash, Quasheba, Quashee, Quashi

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for quasar

The direction of polarization for a quasar is determined by the accretion disk surrounding it.
The Black Hole Tango|Matthew R. Francis|November 24, 2014|DAILY BEAST

British Dictionary definitions for quasar

quasar

/ (ˈkweɪzɑː, -sɑː) /

noun

any of a class of extragalactic objects that emit an immense amount of energy in the form of light, infrared radiation, etc, from a compact source. They are extremely distant and their energy generation is thought to involve a supermassive black hole located in the centre of a galaxy

Word Origin for quasar

C20: quas (i-stell) ar (object)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for quasar

quasar

[ kwā′zär′ ]

Short for quasi-stellar radio source. A compact, starlike celestial body with a power output greater than our entire galaxy. Believed to be the oldest and most distant objects ever detected, quasars are billions of light-years from Earth and moving away from us at nearly 80 percent of the speed of light. For this reason, quasars are highly important to astronomers' understanding of the early universe. Little is currently understood about the nature of quasars; one theory suggests that they are produced by giant black holes destroying enormous amounts of matter, causing the subsequent ejection of radiation along their north and south poles. Many astronomers believe that quasars represent an early stage in the evolution of galaxies such as our own. See also blazar Seyfert galaxy.

单词	quasar
释义	quasar [ kwey-zahr, -zer, -sahr, -ser ] / ˈkweɪ zɑr, -zər, -sɑr, -sər / noun Astronomy. one of over a thousand known extragalactic objects, starlike in appearance and having spectra with characteristically large redshifts, that are thought to be the most distant and most luminous objects in the universe. Also called quasi-stellar object. Origin of quasar 1960–65; quas(i-stell)ar, in quasi-stellar radio source, the first type of quasar discovered Words nearby quasar quartz-iodine lamp, quartzite, quartz lamp, quartz movement, quartz plate, quasar, quasars, quash, Quasheba, Quashee, Quashi Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for quasar The direction of polarization for a quasar is determined by the accretion disk surrounding it. The Black Hole Tango\|Matthew R. Francis\|November 24, 2014\|DAILY BEAST British Dictionary definitions for quasar quasar / (ˈkweɪzɑː, -sɑː) / noun any of a class of extragalactic objects that emit an immense amount of energy in the form of light, infrared radiation, etc, from a compact source. They are extremely distant and their energy generation is thought to involve a supermassive black hole located in the centre of a galaxy Word Origin for quasar C20: quas (i-stell) ar (object) Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Content related to quasar “Hanny’s Voorwerp” Is A Green Space Blob With An Unusual NameA giant green blob floating in the universe? Sounds far-fetched, but its existence is not as far out as its name: Hanny's Voorwerp. READ MORE Scientific definitions for quasar quasar [ kwā′zär′ ] Short for quasi-stellar radio source. A compact, starlike celestial body with a power output greater than our entire galaxy. Believed to be the oldest and most distant objects ever detected, quasars are billions of light-years from Earth and moving away from us at nearly 80 percent of the speed of light. For this reason, quasars are highly important to astronomers' understanding of the early universe. Little is currently understood about the nature of quasars; one theory suggests that they are produced by giant black holes destroying enormous amounts of matter, causing the subsequent ejection of radiation along their north and south poles. Many astronomers believe that quasars represent an early stage in the evolution of galaxies such as our own. See also blazar Seyfert galaxy. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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quasar

noun Astronomy.

Origin of quasar

Words nearby quasar

Example sentences from the Web for quasar

British Dictionary definitions for quasar

noun

Word Origin for quasar

Content related to quasar

Scientific definitions for quasar