Cygnus Nebula 
The Cygnus Loop - radio Source (W 78 , or .Sharpless103) is a large supernova remnant . SNR . in the constellation Cygnus , an emission  nebula measuring nearly 3 across . N1. Some arcs of the loop , known collectively as the Veil Nebula or Cirrus Nebula emit in visible light . N2 . Radio , infrared and X - ray images reveal the complete loop.
Source : Spitzer
+NASA