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Date: 2006-10-02 18:00:00Exploration of the Moon Mars exploration Space exploration Paul Spudis DIRECT Vision for Space Exploration Space policy of the George W. Bush administration Spaceflight Human spaceflight Space policy | NASA Exploration Team MessageAdd to Reading ListSource URL: www.astrosurf.comDownload Document from Source WebsiteFile Size: 2,18 MBShare Document on Facebook |