High Quality Content by WIKIPEDIA articles! Jerry Earl Nelson (born 1944) is an American astronomer known for his pioneering work designing segmented mirror telescopes. He is the principal designer and project scientist for the Keck telescopes. In 1977, when Nelson worked in the Physics Division of the Lawrence Berkeley National Laboratory, he was appointed to a five-person committee to design a 10-meter telescope, twice the diameter of the best telescope of the time. He concluded that only a segmented design would be sensible to overcome structural difficulties. His design had 36 hexagonal mirror segments, each six feet in diameter and just 3 inches thick. This led to the creation of the revolutionary twin 10-meter Keck telescopes. Segments solved the structural problem but created a new one involving the alignment of the segments.

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