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IR reflectivity of stainless must help a good deal for the unshielded parts. I wonder if the internal surface is painted or finished in a way to help radiate the heat away internally.

Is there any active cooling of any of the skin that we know of?

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They've been testing some active cooling tiles (believed to be responsible for the orange residue on the heat shield after reentry in this latest test), but otherwise the only "active cooling" of the skin would be due to the cryogenic propellants being in contact with the inner side of the skin.

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