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pulsar is a stellar or astral heavenly body as a star  which rotates rapidly and produce electromagnetic radiations as a high flash light . 
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pulsar is a highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation. This radiation can only be observed when the beam of emission is pointing toward the Earth, much the way a lighthouse can only be seen when the light is pointed in the direction of an observer, and is responsible for the pulsed appearance of emission. 
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