Deep Sky
NGC7538


Is near the more famous Bubble Nebula, is located in the constellation Cepheus. It is located about 9,100 light years away from earth. It is home to the biggest yet discovered protostar which is about 300 times the size of our Solar System. It is located in the Perseus Spiral Arm of the Milky Way and is probably part of the  Cassiopeia OB2 complex.  Wikpedia