NGC6992 - The Eastern Veil Nebula in the constellation Cygnus

The Veil Nebula, also known as the Cygnus Loop or the Witch's Broom Nebula, is a diffuse nebula in the constellation Cygnus. It is a vast and relatively faint supernova remnant. The star exploded approximately 5,000 to 8,000 years ago, and in that time, the nebula has expanded to cover an area of 3 degrees in the sky. Its distance is estimated to be about 1,470 light-years. This nebula was discovered on September 5, 1784, by William Herschel. The nebula is so large that its parts are considered separate nebulae and have their own names.