Example: the Crab Nebula was the result of a supernova that was seen by Chinese astronomers about 1000 years ago: https://en.wikipedia.org/wiki/Crab_Nebula http

Example: the Crab Nebula was the result of a supernova that was seen by Chinese astronomers about 1000 years ago: https://en.wikipedia.org/wiki/Crab_Nebula https://en.wikipedia.org/wiki/Crab_Nebula