High purity gold reflects infrared (heat) energy almost completely, making it ideal for heat and radiation reflection.
Gold-coated visors protected astronauts' eyes from searing sunlight on the Apollo 11 moon landing.
Gold is also an excellent conductor of thermal energy. It is used in many electronic processes to draw heat away from delicate instruments. For example, the main engine nozzle of the space shuttle uses a 35% gold alloy.
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