Webb Space Telescope Wraps Up Risky Deployment But Faces More Hurdles

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NASA’s $10 billion Sun-orbiting observatory is now on track to begin its years-long mission to look deeper into space than was ever possible before

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“How does it feel to make history, everyone?” Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate, told members of the mission team after the announcement.

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The successful deployment means the most powerful telescope ever launched into space is set to launch later this year to begin its decade-long mission to observe stars and galaxies Because they didn’t appear long after the big bang.

It also provided a respite of sorts for mission controllers, who supervised the deployment of the truck-shaped telescope and conducted breathless surveillance, thanks to the dimensions of which fold-up, origami-style launches into the Ariane 5 rocket’s nose cone. fell. ,

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“It’s definitely been a roller coaster,” Keith Parrish, Webb’s observatory manager at NASA Goddard Space Flight Center, said of his shifting feelings during the deployment process. “It’s excitement. And then immediately, my mind goes to the next thing.”

Some agency insiders expected the deployment to be complete sooner.

“If you had asked someone two months ago, even a month ago, ‘Hey, we’re going to be on January 8,’ I would have said that was widely optimistic and frankly unrealistic to assume,” Dr. Zurbuchen said at a news conference on Saturday ahead of the announcement.

Deployment began shortly after launch on December 25, when Webb’s solar array opened up so that the telescope could begin generating electricity. Other steps in this process include expanding the communications antenna assembly and positioning Webb’s secondary mirrors and a radiator designed to dissipate excess heat.

The most difficult challenge for mission controllers was Detail of the telescope’s five-layer, tennis-court-sized sunshield, which is designed to keep Web’s devices at their extremely low operating temperatures. According to NASA, that move, which involved 70 hinges, 90 cables and 400 pulleys, was completed on Tuesday.

Webb has 344 single-point failure components – pieces of equipment that, if any of them fail to operate as designed, will thwart the entire mission. According to Webb’s Sunshield Manager James Cooper, about 266 of those items were removed with the deployment of sunscreen. “More important to my mind is that we have retired the people who were most likely to be,” he said.

According to Dr. Parrish, the completion of Webb’s deployment meant that an additional 29 single-point failures were retired.

Dr Cooper said the deployment of the sunshield posed the biggest threat to the mission’s success because the motor and cable used to raise the shield were difficult to predict and control because the thin layers of hair are so fragile. Difficulties were encountered during tests of the system in 2018—the layers of the sunshield frayed and torn. It took two more years to complete the final series of deployments and tense tests.

“After all the setbacks this team went through during Sunshield development, it’s really nice to end the story like this,” Dr Cooper said.

The motors were operating at an unexpectedly high temperature last week, but NASA said mission controllers had resolved the problem by commanding the firing of thrusters that replace the telescope to keep the motors in shadow.

Webb is now nearly halfway through with its 29-day journey to a destination called L2 or the second LaGrange point, about 1 million miles from Earth. Once it reaches this perch in orbit around the Sun, Webb will spend about five months cooling down while mission scientists align its mirrors and calibrate its cameras and other instruments.

If all goes well, Webb will release its first images to the public in June.

But Webb still faces obstacles in the coming weeks, including activating and individually adjusting the 18 hexagonal, gold-plated segments that make up the primary mirror—and Making sure the telescope cools down Its minus 388 degrees Fahrenheit operating temperature.

“We’re not going to breathe a sigh of relief at our cooling architecture until we reach those temperatures,” Dr. Parish said.

“There is no individual thing that keeps us going,” he said, in reference to the remaining challenges, before Webb began his remarks. “I think it’s an overwhelming number of activities that we still have to get through.

NASA maintains a webpage Showing current web speed and location in space and Displaying the operating status of the telescope Because it completes the later stages of deployment.

Write Aylin Woodward at [email protected]

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