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pulsar

[ puhl-sahr ]

noun

  1. Astronomy. one of several hundred known celestial objects, generally believed to be rapidly rotating neutron stars, that emit pulses of radiation, especially radio waves, with a high degree of regularity.


pulsar

/ ˈpʌlˌsɑː /

noun

  1. 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


pulsar

/ pŭlsär′ /

  1. A rapidly spinning neutron star that emits radiation, usually radio waves, in narrow beams focused by the star's powerful magnetic field and streaming outward from its magnetic poles. Because the pulsar's magnetic poles do not align with the poles of its rotational axis, the beams of radiation sweep around like the beacon of a lighthouse and are thus observed on Earth as short, regular pulses, with periods anywhere between 1 millisecond and 4 seconds.


pulsar

  1. A rapidly rotating neutron star . The radiation from such a star appears to come in a series of regular pulses (one per revolution), which explains the name.


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Word History and Origins

Origin of pulsar1

1965–70; puls(ating st)ar, on the model of quasar

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Word History and Origins

Origin of pulsar1

C20: from puls ( ating st ) ar, on the model of quasar

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Compare Meanings

How does pulsar compare to similar and commonly confused words? Explore the most common comparisons:

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Example Sentences

We can watch this loss of energy by very carefully studying the blinking of the pulsars.

In 2003, astronomers at CSIRO’s Parkes radio telescope, Murriyang, in New South Wales discovered a double pulsar system 2,400 light years away that offers a perfect opportunity to study general relativity under extreme conditions.

Combining these painstaking measurements allows us to precisely track the orbits of each pulsar.

While physicists have found plenty of individual pulsars, there’s only one known pair orbiting one another.

For over 16 years, scientists have been observing the pair of pulsars, neutron stars that appear to pulsate.

The first clue is the behavior of a pulsar—a tiny but massive object that rapidly rotates, sending flashes of light toward Earth.

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