A portion of the Cygnus Loop. Covering a region on the sky six times the diameter of the full Moon,
A portion of the Cygnus Loop. Covering a region on the sky six times the diameter of the full Moon, the Cygnus Loop is actually the expanding blastwave from a stellar cataclysm - a supernova explosion - which occurred about 15,000 years ago; ESA/Digitized Sky Survey (Caltech) [1500 x 746] -- source link
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