A supernova is the dramatic end of a supergiant star's life. The Crab Nebula is the remnant of a powerful supernova which was visible from Earth in the year 1054. This supernova was so bright that it could be seen in the daytime sky for 23 days, and it was documented by astronomers throughout the Far East. The Crab Nebula is found in the constellation of Taurus and got its name because its outer shape roughly resembles a Crab's pincer.