Known as the dumbbell nebula,

Dumbbell Nebula (M27) is a planetary nebula located in Cygnus, about 1, 360 light years away from the Earth. The name comes from the shape, which looks like a dumbbell or butterfly-shaped object. Dumbbell nebula is a nebula formed by the outer gas released by stars during their evolution. Brightness and morphology have become the research and observation objects of astronomers and astrophotographers. Dumbbell nebula is a relatively young nebula, ranging in age from 3000 to 4000 years. Studying dumbbell nebula can help us understand the evolution of stars and the formation of planetary nebula.