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The difficulty and complexity of performing tests for Webb has increased significantly now that the observatory has been fully assembled. Testing teams employ a wide variety of tools, lifts and cranes to get into the right position to do their work.pic.twitter.com/8AV1zSAJY1
With the completion of this latest systems evaluation, testing teams can confidently move forward knowing that the full assembly of the observatory was a success.pic.twitter.com/7iqqOBCXOD
Testing is the best way to ensure mission success. Comprehensive systems evaluations like the one recently performed help to verify that all of Webb's many pieces, components and electronics are all working in unison as a complete observatory. https://twitter.com/NASAWebb/status/1283132390878191617/photo/1pic.twitter.com/nyjeaDR63V pic.twitter.com/FEf4JgoVsw
Three cheers 
for the highly skilled technicians work for HOURS in this prove position, and must be meticulously careful so as not to damage the telescope, all while wearing those clean room suits!!! Not an easy job! 
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