English Chandra X-ray image of the supernovas remnant Cassiopeia A (Cas A). determination method or standard: work of the federal government of the United...
SHA-1 described at URL: https://chandra.si.edu/photo/1999/casajph URL: https://chandra.si.edu/photo/1999/casajph/casa_scale.tif determination method or...
English Chandra X-ray image of the supernovas remnant Cassiopeia A (Cas A). determination method or standard: work of the federal government of the United...
SHA-1 described at URL: https://chandra.si.edu/photo/1999/casajph URL: https://chandra.si.edu/photo/1999/casajph/casa_scale.jpg determination method:...
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