Do you guys have an official launch date yet? Getting close
The "Pathfinder," or test version of #Webb is actually in the @NASAGoddard cleanroom now, with two flight spare mirrors on it. #JWST https://twitter.com/TheKarthenon/status/872973099444162560 …
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What is a "flight spare" mirror? Can the telescope swap out a mirror a million miles from home?
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Nope, but it could be swapped out on the ground if necessary before launch. (It has not been necessary.)
End of conversation
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What could those "two flight spare mirrors" be used for?!?! Asking for a friend
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