Pulsar

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A pulsar is a neutron star whose magnetic axis is not aligned with the rotational axis. As a result, charged particles which accrete in a disk orbiting around the star's equator are ejected along the magnetic poles, sweep across the sky, and in a very few cases can be detected from Earth as regular pulses in the radio frequency spectrum. Very often these pulses are spaced only a few milliseconds apart, indicating the incredible rotational speed of the pulsar.

In 1974 University of Massechusetts astronomer Joseph Taylor and his graduate student Russell Hulse discovered two pulsars in a very eccentric orbit around each other with a period of 7.75 hours. Over the course of twenty years, their observations of the star's periastron advance (analogous to the perihelion advance of Mercury but a much larger effect as well as the increase in the orbital period helped confirm general relativity, and the two researchers were awarded the 1993 Nobel Prize in physics. [1]

References

  1. David Darling. Gravity's Arc, 2006, John Wiley & Sons
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