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Date: 2006-08-09 23:07:16SETI Fermi paradox Search for extraterrestrial intelligence Allen Tough Contact Civilization Rare Earth hypothesis The Universe Cosmos: A Personal Voyage Astrobiology Extraterrestrial life Spaceflight | Section I An Extraordinary Event Allen ToughAdd to Reading ListSource URL: ieti.orgDownload Document from Source WebsiteFile Size: 373,93 KBShare Document on Facebook |