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Date: 2012-06-14 19:41:50Near-Earth objects Spaceflight Asteroid-impact avoidance Asteroids Arecibo Observatory Spaceguard 99942 Apophis NASA Space debris Space Planetary science Planetary defense | Status of Planetary AstronomyAdd to Reading ListSource URL: neo.jpl.nasa.govDownload Document from Source WebsiteFile Size: 1,38 MBShare Document on Facebook |