Description: Supernova remnant in Taurus. This is what is left of a star that went supernova in 1054 AD. Chinese astronomers recorded that this exploding star was bright enough to be seen in the daytime! The Crab Nebula is still expanding all these years later, I have 35 years of coverage of this on this page. M1 is about 4 x 6 arc minutes in size and is fairly bright at magnitude 8.4 though size is slowly increasing and therefore surface brightness decreasing over time.