sentences:  Thanks to the recorded observations of Far Eastern and Middle Eastern astronomers of 1054, the Crab Nebula became the first astronomical object recognized as being connected to a supernova explosion.In the 1960s, because of the prediction and discovery of pulsars, the Crab Nebula again became a major center of interest.It was then that Franco Pacini predicted the existence of the Crab Pulsar for the first time, which would explain the brightness of the cloud.