The Crab Nebula
![Image](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhW_f0zkGqLHZa2uhGHJ1ktMvevU3izd-KeQelUn7yQV74zFbKHAxsB4QtBb4a2SIHrQCuURB6GyJn1_Bk8m3bzS_jgpE0et_bc5oXX9v7b5Q-2659XCg3AkzR-lvW7wbNCRUAMrdjyRaMfdfC_fp4n2ujx2sWn2-2qLPWK78AUzcseD-rS543VXl2b/w597-h364/Crab_Nebula.jpg)
The Crab Nebula The Crab Nebula, the result of a supernova noted by Earth-bound chroniclers in 1054 A.D., is filled with mysterious filaments that are are not only tremendously complex, but appear to have less mass than expelled in the original supernova and a higher speed than expected from a free explosion. The Crab Nebula spans about 10 light-years. In the nebula's very center lies a pulsar: a neutron star as massive as the Sun but with only the size of a small town. The Crab Pulsar rotates about 30 times each second. The nebula was discovered by English astronomer John Bevis in 1731, and it corresponds with a bright supernova recorded by Chinese astronomers in 1054. The nebula was the first astronomical object identified that corresponds with a historical supernova explosion