Pulsars

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A pulsar is a rotating white dwarf or neutron star whose axis of rotation is not equal to its magnetic poles. Pulsars can rotate at up to 720 times per second, which is a quarter of the speed of light. When a beam of radiation emitted from a pole sweeps by Earth, it is significantly more detectable and said to be "on". When it the beam of radiation is not pointed towards Earth, the pulsar is said to be "off".