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Date: 2013-06-26 23:21:00Science Optical telescope Eyepiece Lens Camera lens Reflecting telescope Refracting telescope Binoculars European Southern Observatory Telescopes Observational astronomy Optics | Space Based Astronomy Educator Guide pdfAdd to Reading ListSource URL: www.nasa.govDownload Document from Source WebsiteFile Size: 241,58 KBShare Document on Facebook |