Astronomers want increasingly large telescopes to peer into the depths of space. To build a solid telescope mirror nearly 30 feet across, you need an oven that heats to 2,100 degrees Fahrenheit and spins around like a top.
Source: http://www.npr.org/2012/01/26/145837380/want-to-make-a-giant-telescope-mirror-heres-how?ft=1&f=1007
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