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http://news.nationalgeographic.com/news/2003/03/0307_030307_impactcrater.htmlhttp://news.nationalgeographic.com/news/2003/03/0307_030307_impactcrater.htmlhttp://news.nationalgeographic.com/news/2003/03/0307_030307_impactcrater.htmlhttp://news.nationalgeographic.com/news/2003/03/0307_030307_impactcrater.htmlhttp://www.sciencemag.org/cgi/reprint/241/4872/1441.pdfhttp://www.sciencemag.org/cgi/reprint/241/4872/1441.pdf