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During an outdoor telescope-making workshop, American astronomer John... News PhotoAstronomer,Astronomy,Color Image,Full Length,Horizontal,Human Interest,Monmouthshire,Outdoors,People,Photograph,Science and Technology,Student,Two People,USA,WorkshopPhotographer Collection: Archive Photos During an outdoor telescope-making workshop, American astronomer John Dobson (left) supervises one of his students, Steve Focht, during the rough-grinding process to make a telescope mirror, Monmouth, Oregon, July 2, 2012. The Dobsonian telescope, a type of Newtonian telescope on a cannon mount, helped to revolutionize amateur astronomy, making it possible for large-aperture telescopes to be home-made with readily-available materials. (Photo by Garth Eliassen/Getty Images)