The nebula pictured is known as the Dumbbell Nebula. The Dumbbell Nebula can be called Apple Core Nebula. The Dumbbell Nebula is a planet nebula in the constellation Vulpecula, The Little Fox. This nebula is the second brightest nebula discovered. This nebula is approximately 1360 light years away. This object was the first planet nebula discovered. The Dumbbell Nebula was first discovered by Charles Messier in 1764. The overall structure of the nebula is said to be prolate spheroid. This nebula is most easily viewed along the equator. Many nebulas contained knots. Patterns of dark and bright knots mark the central region of the nebula. Knots appear is varied in the shapes of their objects. There is a central star within the Dumbbell Nebula, which is known as a white dwarf. 

http://messier.seds.org/m/m027.html

http://www.messier-objects.com/messier-27-dumbbell-nebula/