Messier 1, also known as the Crab Nebula, is a supernova remnant located in the constellation Taurus. It was formed from the explosion of a massive star that occurred around 1054 AD, which was recorded by astronomers of the time. The nebula is approximately 6,500 light-years away from Earth and spans about 11 light-years across. The Crab Nebula is notable for its bright, complex structure and is a source of strong radio and X-ray emissions. It contains a pulsar, a rapidly rotating neutron star, at its center, which emits beams of radiation. This pulsar is the remnant of the original star that exploded, making the Crab Nebula an important object for studying stellar evolution.