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![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c9/Chandra-crab.jpg/360px-Chandra-crab.jpg)
The Crab Pulsar (PSR B0531+21) is a relatively young neutron star. The star is the central star in the Crab Nebula, a remnant of the supernova SN 1054, which was widely observed on Earth in the year 1054.