The Crab Nebula
![Crab Nebula ROSAT HRI Image](slide_gifs/crab.jpg)
(Credit: S. L. Snowden)
Both the Crab Nebula and Crab pulsar are clearly visible in this HRI
image. The supernova precursor to these objects was observed by Chinese
astronomers in the year 1054. The pulsar (the bright compact emission)
produces highly relativistic electrons which themselves produce synchrotron
radiation in the magnetic field of the nebula.
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