After a supernova explosions , all that is left of a star is very hot ball of matter a few kilometers across, spinning at a tremendous rate. It sends out beam of light that is seems to ‘pulse’ on an off. It is called a pulsar.
These remains are the shrunken core of the original star, at a temperature of millions of degrees. One of the strongest pulsars is the star at the centre of the Crab Nebula, which rotates 30 times a second. The fastest known pulsar , however rotates 642 times a second.
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