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Wednesday, 27 April 2011
Tycho supernova
关于 Space and Earth Sciences News 的网页:http://www.google.com/gwt/x?u=http%3A%2F%2Fwww.physorg.com/news/2011-04-tycho-supernova-remnant-evidence-supernovas.html&wsi=40addca89d2d89ba&ei=VlS3Taz9GJvb1QbSsrzsBA&wsc=eb
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