This is a very busy region in Cassiopeia contains at least three different kinds of objects. The largest object in this image is Sh 2-157, a bright emission nebula. Other emission nebulae in this image are NGC 7538, and the famous Bubble Nebula. The bright open cluster M52 is at the bottom right, while the smaller but more interestingly-shaped open cluster NGC 7510 is at the left-center. Finally, in the top left corner is a bright patch of nebulosity called PK 110-0.1, which is a planetary nebula. All of this is visible within a 2°x2° field of view.