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Date: 2006-12-15 10:34:13Spaceflight Space Fermi paradox Scientific controversies Search for extraterrestrial intelligence Drake equation Civilization Carl Sagan Guns Germs and Steel Astrobiology Extraterrestrial life SETI | Paper for IAA 2006 ValenciaAdd to Reading ListSource URL: www.yorku.caDownload Document from Source WebsiteFile Size: 146,02 KBShare Document on Facebook |