James Webb Space Telescope Completes Risky Sunshield Deployment
The unfolding and tensioning of the sunshield took place over the course of eight days, involving 139 of Webb’s 178 release mechanisms as well as 70 hinge assemblies, eight deployment motors, 90 individual cables and roughly 400 pulleys. If that sounds daunting, consider this: the James Webb Space Telescope has 344 so-called single point failures, or individual steps that must work without incident. If any one point fails - a cable gets stuck or a release mechanism doesn’t trigger - the whole project could be in jeopardy....