"M31 widefield ultra-deep."
Giuseppe Donatiello, Public Domain via Flickr: https://flic.kr/p/2nTzewZ Color edit.
M31 widefield ultra-deep
M31 widefield ultra-deep Credit: Giuseppe Donatiello This image is part of a mosaic of greater extension, obtained with captures performed with a 135mm telephoto lenses and DSLRs. The average exposure on the square degree amounts to about 4 hours.Flickr