By Attila Nagy

Mirrors start off as melted glass—and big mirrors need an appropriately large oven to cast properly. It takes a full year to cast segments of the mirrors used to build the …

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Source:: http://feeds.gawker.com/~r/gizmodo/full/~3/PXPFmqPhrdE/the-giant-magellan-telescopes-fourth-mirror-melting-is-1736954773