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Date: 2010-04-16 14:15:25Planetary defense Observational astronomy Space telescopes European Space Agency Spaceguard The Spaceguard Foundation Near-Earth object Lowell Observatory Near-Earth-Object Search Asteroid Astronomy Astronomical surveys Space | Add to Reading ListSource URL: esamultimedia.esa.intDownload Document from Source WebsiteFile Size: 783,54 KBShare Document on Facebook |