Nasa deploys Webb telescope’s sunshield

Published January 5, 2022
This combination of images from a computer animation made available by Nasa in December 2021 depicts the unfolding of the components of the James Webb Space Telescope. — AP/File
This combination of images from a computer animation made available by Nasa in December 2021 depicts the unfolding of the components of the James Webb Space Telescope. — AP/File

CAPE CANAVERAL: The US space agency (Nasa) aced the most complicated, critical job on its newly launched space telescope on Tuesday: unrolling and stretching a sunshade the size of a tennis court.

Ground controllers cheered and bumped fists once the fifth and final layer of the sunshield was tightly secured around the James Webb telescope. It took just 36 hours to tighten the ultra-thin layers using motor-driven cables, half the expected time.

The seven-ton telescope is so big that the sunshield and the primary gold-plated mirror had to be folded for launch. The sunshield is so unwieldy that it spans 70 feet by 46 feet to keep all the infrared, heat-sensing science instruments in constant subzero shadow.

The mirrors are next up for release this weekend.

The $10 billion telescope is more than halfway toward its destination 1.6 million kilometres away, following its Christmas Day sendoff. It is the biggest and most powerful observatory ever launched — 100 times more powerful than the Hubble telescope — enabling it to peer back to almost the beginning of time.

Considered Hubble’s successor, Webb will attempt to hunt down light from the universe’s first stars and galaxies. “This is a really big moment,” project manager Bill Ochs told the control team in Baltimore. “We’ve still got a lot of work to do, but getting the sunshield out and deployed is really, really big.”

Engineers spent years redoing and tweaking the shade. At one point, dozens of fasteners fell off during a vibration test.

Published in Dawn, January 5th, 2022

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