The Cocoon Nebula, Caldwell 19, is a bright emission and reflection nebula in Cygnus. It is around 2,500 light years away. In addition to the Hydrogen emission and other reflections, there is a beautiful cloud of dark interstellar dust surrounding the object. This is an active star forming region.
Here is a close-up of the nebula,
Here is a starless version of the object,
Above the center of frame are three distant galaxies, PGC 167590, 167593, and 167597. I could not find redshift data for PGC 167593, but PGC 167590 is 1.2 billion light years away, and PGC 167597 is 520 million light years away.
It was maybe a little late in the year to image this target, but I persisted. This image is composed of 550 four-minute exposures collected in 10 nights over a span of 40 days, which totals almost 37 hours of exposure. It took my computer over three hours to process 401GB of data to build the combined single image. The image contains 39,318 stars. I used a hard MTF stretch to really show off the dark nebulosity, and processed the stars and nebula separately after stretch and denoise.