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Thursday, November 22, 2018

Checking for flaws in the 21 ton glass blank of the 200 inch mirror for the Mount Palomar telescope, Corning Glass Works, Ithaca, New York, 1935 [955x748]


http://bit.ly/2Qcqxwc via /r/spaceporn http://bit.ly/2DFf6pZ

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