Once completed, the Giant Magellan Telescope will be made up of seven mirrors: 28-feet in diameter and weighing 12.5 tons each.
Each mirror, like the one shared below, is being constructed at the University of Arizona's Steward Observatory and takes about 42 months, from casting to polishing, to complete.
Copyright Ray Bertram, Steward Observatory
#Telescope #GMTO #Space #astronomy #BigScience
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