The @NASAWebb has arrived here in Houston for its last cryogenic test before launch in 2018. Learn more: https://www.nasa.gov/feature/james-webb-space-telescope-arrives-at-nasa-s-johnson-space-center …pic.twitter.com/okU0z0jpZT
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To avoid another almost billion dollar waste like hubble almost was when there wasn't time to test it before it launched. Oops.
You can read more about lessons learned from Hubble and how our test plan differs here: https://jwst.nasa.gov/faq.html#mirrortests …