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the pulsar
noun
A rotating neutron star that emits radio pulses periodically
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The pulsar is in the constellation Sagittarius, about 15,000 light-years from Earth.
(Beware the packaging: the Pulsar 590, without the letter A, does not include the transmitter).
The pulsar designated PSR J1939+2134 was the fastest known for more than two decades.
In 1992, astronomers using the same technique detected a pair of planets (or their corpses) circling the pulsar PSR1257+12.
They could not be survivors of the supernova explosion that formed the pulsar, but they may have formed from a disk of stellar material that fell back toward the pulsar after the supernova.
Irregularities in the radio emissions of the pulsar PSR 1913 + 16 led them to deduce that the pulsar had a companion neutron star with which it was locked in a tight orbit.
After the supernova, the neutron star accretes matter from its companion, causing the pulsar to spin faster.
The variation was interpreted as due to motion of the pulsar toward and away from the Earth as one or more planet-sized objects orbit the pulsar, gravitationally tugging it to and fro.
Scientists using the Arecibo Observatory discovered the first extrasolar planets around the pulsar B1257+12 in 1992.
However, sometimes the coupling between the crust and interior becomes stronger, spinning up the pulsar and causing a glitch.
The three planets orbit the pulsar at distances between 19% and 47% of the Earth-Sun distance.
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