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Created page with "== Introduction == A supernova remnant (SNR) is the structure resulting from the explosion of a star in a supernova. The supernova remnant is bounded by an expanding shock wave, and consists of ejected material expanding from the explosion, and the interstellar material it sweeps up and shocks along the way. Image:Detail-46095.jpg|thumb|center|A wide field image of a supernova remnant, showing the diffuse, glowing gas and dust clouds in various shades o..."