Labels:earth | palisade | pole | reckoner | sky OCR: al velocity about 300 kilometers per second The observed many supermova remnants rorm the material glows because the shock wave energy explosion has hit it giving the atorns the The abundance of nitrogen indicates material came frorm the outer lavers of to as star before it exploded in a process refer abou phsered rennants shoci civing nitrocen evol lved
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