1 Optical Telescopes› Refracting telescope› Reflecting telescope› Space telescopes Other telescopes› Radio telescopes› Infra-red sensing› X-ray, gamma ray emissions2Found radio emission from Milky Wayfrom Milky Way1933http://www.nrao.edu/whatisra/hist_jansky.shtmlhttp://www.nrao.edu/whatisra/hist_jansky.shtml3http://www.nrao.edu/whatisra/hist_reber.shtml http://www.nrao.edu/whatisra/radiotel.shtmlhttp://www.nrao.edu/whatisra/hist_reber.shtmlPlains of San Agustin, New Mexico, USAVery Large Array in golden glow at duskPhoto by Kelly D. Gatlin4http://seds.lpl.arizona.edu/nineplanets/nineplanets/pxsol.html• http://www.spitzer.caltech.edu/about/greatobs.shtml5Dark nebula in OrionProtostars at base of head• http://www.noao.edu/image_gallery/html/im0057.htmlOriginal PhotoSix months later 1 second of arc = 1/3600 of a degree Closest star is 4.3 light years away Light year is not a time period, it is a gy p ,distance› How far light travels in a year› 9.5 trillion kilometers› 5.8 trillion
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