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Date: 2013-04-30 20:19:58Space policy Project Constellation Mars exploration Vision for Space Exploration Science Mission Directorate NASA DIRECT Space Shuttle program Exploration Systems Architecture Study Spaceflight Human spaceflight Exploration of the Moon | NASA Portrait: Administrator Michael GriffinAdd to Reading ListSource URL: www.nasa.govDownload Document from Source WebsiteFile Size: 1,44 MBShare Document on Facebook |