Of all the cool pictures taken by the Hubble telescope and astronomers of the world, the most captivating pictures are the ones of beautiful nebulas. Crazy nebula photos capture these ethereal wonders in a variety of shapes and colors unlike anything seen on earth other than the Aurora Borealis. Either the beginning or end of a star, a nebula is predominantly made of gas and dust; while these materials usually look pretty boring in on an earthly level, in space they create stunning clouds of light and color. If watching clouds doesn't do it for you, maybe consider getting a telescope to look at nebulas that resemble animals. From the cat's eye nebula to the shark nebula, cool astronomy photos depict something for the fans of felines and Shark Week alike.