Image from a series of LRGBHa images, total exposure 12 Hours (approx), 37 XHa 600s, 19 X L 600s, 6 X RGB 600s (6 of each layer). Treatment with PixInsight
Called the Veil Nebula, the debris is one of the best-known supernova remnants, deriving its name from its delicate, draped filamentary structures. The entire nebula is 110 light-years across, covering six full moons on the sky as seen from Earth, and resides about 2,100 light-years away in the constellation Cygnus, the Swan.
In this image, red corresponds to the glow of hydrogen, green from sulfur, and blue from oxygen. The bluish features, outlining the cavity wall, appear smooth and arched in comparison to the fluffy green and red structures. The red glow is from cooler gas that was excited by the shock collision at an earlier time and has subsequently diffused into a more chaotic structure.
The supernova that created the Veil Nebula would have been briefly visible to our very distant ancestors roughly 8,000 years ago as a bright "new star" in the northern sky.
Souce Science Daily :
https://www.sciencedaily.com/releases/2015/09/150924104420.htm
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