Actual operating temperature of @NASAWebb's instruments will be -266C [-447F, 7K].
Replying to @ROCKETDRAG
Only our Mid-Infrared Instrument. It has a cryocooler and operates at 7K. The others work at about 39K. https://jwst.nasa.gov/faq.html#temps
8:54 AM - 17 Aug 2017
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