The door to @NASA_Johnson's massive Chamber A is shut; our ~100 day cryogenic test of #Webb commences! Read more: http://go.nasa.gov/2ufyztO pic.twitter.com/dKwSzCjIUD
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How do you chill a vacuum? It it more to do with removing the background heat of the telescope structure?
Additionally the helium shroud in the Chamber has a surface temp in view of Webb; heat is radiated between shroud and Webb to required temp.