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10) We tested the 2 halves of #NASAWebb in different thermal vacuum chambers at @northropgrumman & @NASA_Johnson. These huge chambers can match the vacuum of space and be cooled to the temperatures (-387 F, or -232.8 C) at which Webb needs to operate! 
https://go.nasa.gov/2AfuJnt pic.twitter.com/9SDlPsEbHc
11) #NASAWebb also spent time at @NASA_Johnson getting its “eyes” checked, or verifying that light would travel correctly through its optical system. We used test hardware that acted as a source of artificial starlight. 
https://go.nasa.gov/2fj6TxZ pic.twitter.com/PpzAv6Wnad
12) #NASAWebb is now in its final suite of testing before being shipped to its launch location. Up next: some more deployment testing, plus another full systems evaluation.
For more on Webb’s testing journey, read our Tumblr: https://nasa.tumblr.com/post/631437243045822464/10-ways-the-webb-telescope-trains-for-space …pic.twitter.com/4xdKRXTkO9
Cannot wait for the first images from the JWST. I'll just have to be patient.
soooo, this may be an odd question; How do you keep mirrors clean in space?
They won't need to be cleaned! We'll be orbiting the Sun a million miles from Earth, rather than orbiting the Earth where there is a lot of debris. Test done showed that micrometeoroids will have a negligible effect on the beryllium mirrors.
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To simulate that level of extreme noise, Webb’s complete structure was recently blasted with powerful sound waves. 
Read our latest feature: 
Each line of code for Webb was tested & retested as different lines were combined into larger software components: 
The sunshield is critical for protecting the telescope's sensitive mirrors & instruments from light and heat: 
We ran through these complex procedures, plus we used special equipment to simulate how we’ll “talk” to Webb in space: 
