Dr Mather explaining accuracy of the #JWST mirrors ...within 3" when defining the size of the United States. #askNASApic.twitter.com/rYvvsP0AcG
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@bbuckner@NASAWebbTelescp Accuracy in terms of deviation from flat? From desired shape? (Is each hexagonal lens planar?)#JWST
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@NASAWebbTelescp@bbuckner Wow! So <0.1um form error?! Measured via interferometer? Just tell me when the q's get too annoying.#engineer -
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