pulsar(redirected from Pulsars)
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Related to Pulsars: Quasars
Any of several celestial objects emitting periodic, short, intense bursts of radio, x-ray, or visible electromagnetic radiation, generally believed to be quickly rotating neutron stars.
[From puls(ating st)ar (influenced by quasar).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Astronomy) any of a number of very small extremely dense objects first observed in 1967, which rotate very rapidly and emit very regular pulses of polarized radiation, esp radio waves. They are thought to be neutron stars formed following supernova explosions
[C20: from puls(ating st)ar, on the model of quasar]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
any of several hundred known celestial objects, generally believed to be rapidly rotating neutron stars, that emit pulses of radiation, esp. radio waves, with a high degree of regularity.
[1968; puls(ating st)ar, on the model of quasar]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A spinning neutron star that emits radiation, usually radio waves, in very short and very regular pulses. Because a pulsar's magnetic poles do not align with the poles of its axis, its beams of radiation sweep around like the beacon of a lighthouse.
Did You Know? When a very large star goes off like a giant bomb in an explosion called a supernova, the core of the star collapses into either a neutron star or a black hole. In 1054, one of these explosions could be seen in the sky during both day and night for 23 days. Chinese astronomers took note of this "guest star," and rock paintings and pottery found in Arizona and New Mexico suggest that Native Americans recorded it, too. In the 18th century, astronomers discovered in the constellation Taurus the leftovers that had been blown away by this explosion, the bright cloud called the Crab Nebula. In the late 1960s, 900 years after the supernova, astronomers found a source of rapidly pulsing radio waves, with 30 flashes per second, near the center of this nebula. The source of this pulsating radiation is an object that was named a pulsar. We now know that a pulsar is a rapidly rotating neutron star whose radiation is emitted like a spinning flashlight. Over 700 pulsars have now been detected, with rates of rotation ranging from once every 4 seconds to more than 600 times per second.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A rapidly rotating neutron star that gives off regular bursts of radio waves.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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|Noun||1.||pulsar - a degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation|
neutron star - a star that has collapsed under its own gravity; it is composed of neutrons
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
pulsar[ˈpʌlsɑːʳ] N → pulsar m
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
n → Pulsar m
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
pulsar[ˈpʌlsəʳ] n → pulsar m or f inv
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995