One upon a time, the largest glass telescope mirror was 100 inches in diameter. Today, scientists are casting a mirror 27 feet in diameter that will be part of one of the most powerful telescopes on Earth. NPR's Joe Palca speaks with weekends on All Things Considered host Guy Raz from the mirror laboratory, located under the football stadium at the University of Arizona.
Source: http://www.npr.org/2012/01/14/145235055/mega-mirror-to-power-massive-new-telescope?ft=1&f=1007
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