Crab Nebula has been constantly observed by Chandra ... The image, captured by NASA's Chandra X-ray, indicates the location of different elements in the Cassiopeia A supernova remnant, including ...
ABSTRACT Published images of the Crab Nebula have been scanned and measured to derive proper motions, the age of the nebula, and its point of origin. Astrometric reductions provided rms errors ranging ...
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