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PULSE: The Impact of European Pulsar Science on Modern Physics Pulsars are neutron stars that rotate quickly, up to 600 times per second. They are compact -- only 20 kilometres in diameter -- leftovers of supernova explosions. Nonetheless they have a mass 1.4 times that of our sun, and a very strong magnetic field. They emit beams of radiation from two regions above their magnetic poles, using a mechanism that is not completely understood.
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