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Supernova\'s ghost caught expanding in new video

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by worrg, 9 years ago
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Read more: www.newscientist.com This new movie of the supernova remnant Cassiopeia A was made by combining Chandra X-ray satellite observations taken in January 2000, February 2002, February 2004 and December 2007. The debris is expanding more slowly than expected, probably because the energy of...