SUMMARY: Workers at the University of Arizona Steward Observatory Mirror Lab have cast the first mirror for the Giant Magellan Telescope. By the time they're complete, the lab will cast a total of 7 of these enormous 8.4-metre (27-foot) mirrors, giving the enormous observatory the equivalent of a 22-metre aperture. The Giant Magellan Telescope will be constructed in Northern Chile by 2016.

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