A bunch of galaxies in Pegasus.
There are two different clusters of galaxies in this image – the large galaxy you see is NGC 7331, part of the “Deer Lick Galaxy Group.” The smaller galaxies you see surrounding it (sometimes called “The Fleas”) are actually about ten times further away than NGC 7331.
In the corner, you’ll see “Stephan’s Quintet,” a group of galaxies that actually are close together and interacting with each other gravitationally, producing the strange shapes you see in these galaxies.
This image represents a bit over 5 hours of exposure time, taken from my suburban driveway and augmented with another hour of exposure from a darker site nearby.