The world’s largest telescope is edging closer to completion – Yahoo News Australia

This week, the University of Arizona’s Steward Observatory Mirror Lab began work on the sixth of seven primary mirror segments for the Giant Magellan Telescope (GMT). On March 1st, the lab started heating its one-of-a-kind glass furnace to a temperature of 1,165 degrees Celsius. That in itself was a major milestone in a manufacturing process known as spin-casting. It took about four months to make the mold and another nine hours to cover it in nearly 90 tons of rare borosilicate glass.
On Friday,…

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