Why Space Missions Use Gold (and It's Not For Bling)

How Precious Metals are Vital to Space Exploration, Gold and platinum have long been used in space telescope mirrors, but most telescope designs also protect the precious metals with a layer of some other material. In optical solar reflectors, a second mirror on the surface incorporates silver or aluminum with a layer of quartz. These reflectors help control temperature in environments high in radiation. James Webb Space Telescope
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