The Cygnus Loop is a large spheroidal supernova remnant. What we are really looking at is material either blown out from the supernova star or gathered up by the shock fronts moving out from the explosion. If large enough, a
Crescent Nebula (NGC6888) in SHO Askar 151phq; AP Mach2 GTO, ASI6200MM, – Chroma RGB & 5nm Narrowband FiltersH,O,S: (37,24,27 x 720s 61Bin 1, Gain 100) R,G,B: (16,15,12 x 120s, Bin 1, Gain 100)Total integration time = 19.0 hrs (June 12,13,14,18,20,22