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] via /r/spaceporn http://ift.tt/1S6qCcl
via Tumblr http://ift.tt/1kI5Sg8
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