TIL the gold on the mirrors of the 10 billion dollar James Webb Space telescope weighs a little over 48 grams, or 1.7 ounces. That’s less than $3000 at the current price.

Read more: https://webbtelescope.org/quick-facts/telescope-quick-facts

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  1. They almost certainly used 5N gold or better. If it was 5N purity you’d want to triple that price. (Still not a lot – the process of coating would have been far more expensive than the gold that actually ended up on the mirror).

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