The Veil Nebula, also known as the Cygnus Loop or the Witch's Broom Nebula, is a large, relatively faint supernova remnant in the constellation Cygnus. The source supernova exploded some 5,000 to 8,000 years ago, and the remnants have since expanded to cover an area of ~3x3 degrees; about 6 times the diameter or 36 times the area of a full moon.
href="http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License="> /">GNU Free Documentation License acquired from Veil Nebula on date 17 July 2009.