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Another classic pair of dissimilar objects in the same small field of view. In the upper left is open cluster M52 while at the lower right is the Bubble Nebula (= NGC 7635). The main feature of the Bubble Nebula doesn't just look like a 3-D bubble, it really is one: a giant molecular cloud being pushed outward in a spherical shape by solar wind from the magnitude-8.7 star located in the upper part of the bubble. There is red H-II emission throughout this region; the nebulosity in the upper right extends beyond the picture and is known as LBN 547.
This is a total of 3 hours of exposure (2.5 hours H-alpha, 30 minutes RGB).