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Explanation: TheCrab Nebula, filled with mysterious filaments, is the result of astar that was seen to explode in 1054 AD. This spectacularsupernova explosion was recorded byChinese and (quite probably)Anasazi Indian astronomers. The filaments are mysterious because they appearto haveless mass than expelled in the original supernovaandhigher speed than expected from a free explosion.In theabove picture taken recently from aVery Large Telescope, the color indicates what is happening to the electrons in differentparts of theCrab Nebula.Red indicates theelectrons are recombining with protons to form neutral hydrogen,while blue indicates theelectrons are whirling around the magnetic fieldof theinner nebula. In thenebula's very center lies apulsar: aneutron star rotating, in this case, 30 times a second.