WO Redcat 51
SH2-157, also known as the Lobster Claw Nebula, is an emission nebula located about 11,000 light-years away in the constellation of Cassiopeia. The red/orange portions of the nebula are made up of strong HII regions predominantly yellow part of the nebula is a very large H II region. The blue-colored regions are predominately from the emission of light from molecular oxygen. Towards the top right of the image, you can see NGC 7635 - the Bubble Nebula, which is much more widely known. Also visible is the star cluster NGC 7510, seen at the bottom right of the image.
