Cassiopeia (pronounced kass ee oh pee' uh ... The first target on our list is both famous and difficult to see well: the Bubble Nebula (NGC 7635). It's also the 11th object on Sir Patrick ...

Nebulae are gigantic clouds of gas and dust that exist in space between stars. Check out 7 mesmerizing photos of this cosmic ...

One of the youngest supernova remnants in our galaxy, Cassiopeia A glows with the energy of a star’s final breath.