The Crescent Nebula is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. - Wikipedia

Blair noted that the Soap Bubble Nebula, Ju 1 (also known as PN G075.5+01.7) planetary nebula is above and to the left of the Crescent Nebula nearer the top of the image in this orientation.