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In a look at the Steward Observatory Mirror Laboratory at the University of Arizona, in Tucson, we meet people on a quest for near perfection: making telescope mirrors with impossibly polished surfaces, smoothed down to a billionth of an inch (0.0254 nanometers) CLICK LINK;- http://news.nationalgeographic.com/news/2014/11/141106-steward-video-mirror-astronomy-telescope-science/?utm_source=Twitter&utm_medium=Social&utm_content=link_tw20141106news-mirrors&utm_campaign=Content&sf5640944=1