Deploying the sunshade is crucial to its ability to look back toward the birth of the cosmos.
The deployment of the first boom was held up several hours to give engineers time to make sure the protective covers had, in fact, rolled off to the side of the sunshade pallets as required.
"The deployment of the five telescoping segments of the motor-driven mid-boom began around 1:30 p.m., and the arm extended smoothly until it reached full deployment," NASA said. "Today is an example of why we continue to say that we don't think our deployment schedule might change, but that we expect it to change," said Keith Parrish, the observatory manager at NASA's Goddard Space Flight Center.
Simply extending the sunshade is not enough for Webb to meet its science goals. For the shield to work properly, blocking out heat from the sun, its five layers must be pulled taut and separated.
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