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The critical phase of the James Webb solar shield was successful

BingMag.com The <b>critical</b> <b>phase</b> of the <b>James</b> <b>Webb</b> <b>solar</b> <b>shield</b> was successful

The James Webb Space Telescope has successfully stretched all five layers of its tennis shield the size of its tennis court, a necessary step in the scientific operation of the telescope and the most stressful deployment. The challenging process of fully deploying the James Webb sunscreen, which required the precise pulling of each of the five thinner shells of human hair, was a valuable success on January 4th. It was a relief for thousands of engineers involved in the project during its nearly three decades of development, as well as the countless scientists around the world who are eager to publish groundbreaking web observations.

Keith "Yesterday we did not think we would go to the first three layers, but the mission team did everything perfectly," said Parrish, director of the James Webb Space Telescope Observatory. "We wanted to do just one, but the operation went very well, and the mission team kept asking to continue, so we had to slow them down a bit."

Having the right traction for each of the 5 layers of sunscreen It was made possible by a sophisticated system of cables and motors that wound the layers into the corners of a diamond-shaped solar shield. The precise tightening of the shells began on Monday, January 3 (morning of January 5) with the continuous stretching of the first three layers to leave two layers for January 4 (evening of January 5).

successful establishment of the fourth layer per hour 10:23 a.m. The Eastern Time Zone (18:53 Tehran time) was confirmed when the telescope was 879,000 kilometers from Earth. The fifth and last layer was fully stretched at 12:09 Eastern time zone (20:39 Tehran time) and the successful end of the operation was accompanied by the happiness of the control teams.

One of the operations managers in this regard "This is a really big moment and I want to congratulate the whole team," he said. "We still have a lot of work to do, but the deployment of the sunshade is really a big step." Completely simulate in space. If something went wrong, the entire $ 10 billion mission, which took nearly three decades to research and develop, would be in jeopardy.

The James Webb Space Telescope for The study of the universe is designed for infrared wavelengths, so it must be very cold for its sensitive detectors to work according to design. For this purpose, scientific instruments must be protected from any excess heat, and the sunshade will keep the web completely cool by reflecting the sun's radiation and the heat of the planet Earth.

With the ultimate goal of detecting very faint light from the farthest stars And galaxies, the objects that lit up the dark world in the first hundreds of millions of years after the Big Bang, Web detectors must be very sensitive. "Any heat from the telescope can dominate the detectors, preventing weak, weak signals from being seen." "We will have a temperature drop of about 55 degrees Celsius in each layer," Paris said. "Thus we will have a temperature difference of about 330 degrees Celsius between the hot side and the temperature I call the coldest temperature of the observatory, the temperature of the detectors of scientific instruments, which will be about minus 235 degrees Celsius."

Obstacles

This challenging operation took place as humans struggled on Earth with a new strain of the corona virus created by a newly discovered strain of omicron that forced team members into quarantine. "One of the challenges is that we have had to quarantine people who have been working on this for a long time," Parish said. "But fortunately today we can still keep them connected to our circle of operations, and they can help us remotely from wherever they are."

The James Webb Space Telescope is moving to a point Known as the Lagrangian point 2 of the Earth-Sun, it is located 1.5 million kilometers from the planet Earth. L2 is one of the five equilibrium points of the earth and the sun, at which the interaction of the gravitational forces of two masses causes objects to remain stable. So the Web telescope orbits the sun, is constantly aligned with the earth, and is hidden from the burning rays of the star.

  • The breathtaking path of the James Webb Space Telescope See Historic Launch to Deploy

As the sunshade fully opens and tightens, operations teams will move toward deploying the telescope's secondary mirror. "Starting this afternoon, we will turn on a few heaters so that the motors operating the secondary mirror system can heat up and then be able to activate them," Paris said. Receipt. Upon arrival, all parts will be fully deployed, including the 6.5-meter main mirror, which, due to its large size, must be retractable inside the launcher.

It takes 100 days for up to 18 parts. Gold-plated mirror side to reach its cold operating temperature. These mirrors are then carefully aligned so that the seams between them are completely removed and astronomers can take clear images of the farthest corners of the universe. Thus, it is expected that in the summer of 2022 we will see the first images of this telescope, as the most complex and expensive space observatory ever built.

Cover photo: Graphic design of the James Webb Space Telescope after full sun installation
> Credit: NASA


Source: Space

Tags: critical, phase, james, webb, solar, shield, successful

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