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===Structure===
Although the bus willwas primarily designed to operate in the weightless environment of outer space, during launch it must survive the equivalent of 45 tons.<ref name="spaceflightinsider.com"/> The structure can support 64 times its own weight.<ref name="compositesworld.com">{{Cite web|url=http://www.compositesworld.com/news/james-webb-space-telescope-spacecraft-inches-towards-full-assembly|title=James Webb Space Telescope spacecraft inches towards full assembly 2015|access-date=2016-12-13|archive-date=2019-10-24|archive-url=https://web.archive.org/web/20191024213903/https://www.compositesworld.com/news/james-webb-space-telescope-spacecraft-inches-towards-full-assembly|url-status=dead}}</ref>
{{blockquote|The spacecraft structure provides state of the art capabilities to support the James Webb Space Telescope's first light mission.|A Webb Telescope spacecraft manager as quoted by Composites World<ref name="compositesworld.com"/>}}
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The bus structure itself weighs {{convert|350|kg|lb|abbr=on}}.<ref name="aura-astronomy.org"/>
Once JWST iswas launched, itthe bus beginsbegan to unfoldedunfold and extend to its operating configuration.<ref name="https://jwst.nasa.gov/faq.html">{{Cite web|url=https://jwst.nasa.gov/faq.html|title = FAQ Full General Public Webb Telescope/NASA}}</ref> The plan iswas that during its first week of operation, the deployable tower willwould extend, which willwould separate the bus from the upper spacecraft by about 2 meters.<ref name="https://jwst.nasa.gov/faq.html"/>
==Testing ==
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