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Date: 2009-07-22 14:05:44Planetary defense Astronomical surveys Asteroids Asteroid-impact avoidance Earth 99942 Apophis Near-Earth object Spaceguard Asteroid Astronomy Space Planetary science | WHITE PAPER KEY POINTS AND RECOMMENDATIONS FROM THEAdd to Reading ListSource URL: www.nss.orgDownload Document from Source WebsiteFile Size: 145,71 KBShare Document on Facebook |