Our assembled @NASAWebb telescope passed a critical test: full sunshield deployment!
The reflective, 5-layer sunshield is the size of a tennis court and will protect the telescope's mirrors and scientific instruments from light and heat. Details: https://www.nasa.gov/feature/goddard/2019/nasa-s-james-webb-space-telescope-clears-critical-sunshield-deployment-testing?utm_source=TWITTER&utm_medium=NASA&utm_campaign=NASASocial&linkId=75685421
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