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Date: 2014-10-25 10:47:38Planetary defense Asteroids Space Launch System Asteroid-impact avoidance Orion Space exploration Near-Earth object DIRECT Spacecraft Spaceflight Space technology Human spaceflight | NASA’s Asteroid Redirect Mission Michele M. Gates Human Exploration and Operations Mission Directorate September 5, 2013Add to Reading ListSource URL: sites.nationalacademies.orgDownload Document from Source WebsiteFile Size: 3,82 MBShare Document on Facebook |