Did the math. The gold in JWST’s primary mirror is worth about $2000: Roughly 0.00002% of the total ‘scope cost.http://www.slate.com/blogs/bad_astronomy/2016/05/04/jwst_huge_gold_covered_mirror_completed.html …
Replying to @BadAstronomer
@BadAstronomer The amount of gold used is about the mass of a golf ball! Calculation here: http://jwst.nasa.gov/facts.html
10:16 AM - 5 May 2016
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