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The Crab Nebula is a supernova remnant and pulsar wind nebula in the constellation of Taurus. The nebula was first observed by John Bevis, and corresponds to a bright supernova recorded by Chinese and Arab astronomers in 1054. At X-ray and gamma-ray energies above 30 KeV, the Crab is generally the strongest persistent source in the sky, with measured flux extending to above 1012 eV. Located at a distance of about 6,500 light-years from Earth, the nebula has a diameter of 11 ly and expands at a rate of about 1,500 kilometers per second. (Source: Wikipedia) |
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