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Date: 2013-04-30 20:24:00Exploration of the Moon Mars exploration Space colonization Space exploration Lunar outpost Orion DIRECT Shuttle-Derived Launch Vehicle Ares I Spaceflight Space technology Human spaceflight | Summary Description of Previous StudiesAdd to Reading ListSource URL: www.nasa.govDownload Document from Source WebsiteFile Size: 59,12 KBShare Document on Facebook |