Tons Of Molten Glass Go Into Making Mirror For Giant Telescope

One of seven large mirrors for the 72-foot telescope will be spun cast at the University of Arizona on Saturday.

Source: http://www.npr.org/blogs/thetwo-way/2013/08/24/215156780/tons-of-molten-glass-go-into-making-mirror-for-giant-telescope?ft=1&f=1007

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