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

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 ...

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

IC 63 -- nicknamed the Ghost Nebula -- is about 550 light-years from Earth. The nebula is classified as both a reflection nebula -- as it is reflecting the light of a nearby star -- and as an ...