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Mirrors start off as melted glass—and big mirrors need an appropriately large oven to cast properly. It takes a full year to cast segments of the mirrors used to build the Giant Magellan Telescope, ...
aluminized the mirror of the largest single-mirror telescope in North America. Technicians at the MMT Observatory on Mount Hopkins bolted a vacuum chamber directly over the 6.5-meter (21.5 – foot) ...
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