October 23, 2021

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Giant Magellan Telescope project casts sixth mirror

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The Giant Magellan Telescope (GMT) project has started crafting another mirror segment. 

A big furnace containing 20 tons (17.5 metric tons) of pure borosilicate glass began rotating on Friday (March 5) at the University of Arizona’s Richard F. Caris Mirror Lab, kicking off the spin-casting process for the sixth of seven elements that will make up the GMT’s 82-foot-wide (25 meters) primary mirror.



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