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Spaceflight Space policy Exploration of Mars Exploration of the Moon Manned missions to Mars Vision for Space Exploration Space Station Freedom NASA DIRECT Human spaceflight Space Exploration Initiative Michael D. Griffin | 1 Closing Remarks American Astronautical Society’s 50th Goddard Memorial Symposium First Day March 28, 2012Add to Reading ListSource URL: www.spacepolicyonline.comDownload Document from Source WebsiteFile Size: 61,08 KBShare Document on Facebook |