The third of the seven primary mirrors for the Giant Magellan Telescope was cast Saturday at the University of Arizona's Steward Observatory Mirror Lab.
via LiveScience.com http://www.livescience.com/39244-giant-magellan-telescope-mirror-casting.html
via LiveScience.com http://www.livescience.com/39244-giant-magellan-telescope-mirror-casting.html
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