NGC7635 The Bubble Nebula also known as Sharpless 162, and Caldwell 11, is approximately 7800 light years from earth. It is about 6 light years in diameter. NGC7635 lies in the constellation Cassiopeia. The powerful stellar winds from a Wolf-Rayet Star create the sphericial bubble. A Wolf-Rayet Star is an unusually powerful star, discovered by astronomers Charles Wolf and Georges Rayet. (Photo and caption by Bill Snyder)
