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The Infra Red Mirror
Gold is absorbing every color except gold, which it reflectis reflecting the gold light. They spend literally about three months calebrating these mirrors, just to make sure that they are as focused as physically possible on a secondary mirror. And then each individual honeycomb can move in like six degrees of freedom, and can till it can pan. These things are so well polished that if you expanded the j b s t to the size of the continental united states, o good, the difference between the highest mountain and lowest ocean valley would be two inches.