NGC 6888

NGC 6888, also known as Caldwell 27, Sharpless 105, and the Crescent Nebula, is an emission nebula in the constellation Cygnus, discovered in 1792. It's an expanding bubble of ionized gas sculpted by winds from the Wolf-Rayet star WR 136, spanning 25 x 18 arcminutes. The apparent magnitude is 7.4 and the distance from Earth is approximately 5,000 light-years.