NASA’s new powerful space observatory, the James Webb Space Telescope, was dropped by a larger-than-expected micrometeroid in late May, causing some damage to one of the spacecraft’s 18 main mirror segments. The impact means the mission team will have to correct the distortion created by the impact, but NASA says the telescope “is still operating at a level that exceeds all mission requirements.”
NASA’s James Webb Space Telescope, or JWST, is the agency’s incredibly powerful next-generation space telescope designed to look into the farthest reaches of the universe and look back in time to the stars and galaxies that formed just after the Big Bang. . It cost NASA nearly $ 10 billion to build and more than two decades to complete. But on Christmas 2021, the telescope finally launched into space, where it underwent an extremely complex deployment process before reaching its final destination about 1 million miles from Earth.
NASA expected JWST to be hit by small space particles
Since its launch, JWST has been hit by at least four different micrometeoroids, according to a NASA blog post, but they were all small and the size of what NASA expected the observatory to encounter. A micrometeoroid is usually a small fragment of an asteroid, usually smaller than a grain of sand. However, the one that hit JWST in May was bigger than what the agency had prepared for, although the agency did not specify the exact size. NASA acknowledges that the impact, which occurred between May 23 and May 25, caused a “negligible detectable effect in the data” and that engineers are continuing to analyze the effects of the impact.
NASA expected JWST to be hit by small space particles in its lifetime; fast-moving spots of space rocks are simply an inevitable feature of the deep space environment. In fact, NASA designed the telescope’s gold-plated mirrors to withstand the impact of small space debris over time. The space agency also did a combination of simulations and ground tests with mirror samples to determine how best to strengthen the mirrors to withstand micrometeorological impacts. However, NASA says the models they used for these simulations did not have such a large micrometeroid, and this is “beyond what the team could test on Earth.”
However, this is not a complete surprise. “We’ve always known that the Web will have to withstand a space environment that includes harsh ultraviolet light and charged particles from the Sun, cosmic rays from exotic sources in the galaxy, and accidental micrometeroid strikes in our solar system,” said Paul Geithner, deputy technical director. of the project at NASA’s Goddard Space Flight Center, a statement said.
The main mirror of JWST, subjected to Earth testing Image: NASA
Engineers also have the ability to maneuver the JWST mirror and instruments away from space debris showers if NASA can see them coming. The problem, however, was that this micrometeoroid was not part of a shower, so NASA considered it an “inevitable coincidence.” However, the agency has formed an engineering team to devise ways to potentially avoid or reduce the effects of micrometeorological shocks of this magnitude. And because JWST is so sensitive, the telescope will also help NASA better understand how many micrometeroids there are in the middle of deep space.
Despite the strike, NASA remained optimistic in its publication on the future of JWST. “The effectiveness of Webb in early life is still well above expectations and the observatory is fully capable of carrying out the science it is designed to achieve,” according to the blog. Engineers can also adjust the affected mirror to help eliminate data distortion. The mission team has already done this and will continue to tinker with the mirror over time to achieve the best results. This is a process that will continue over the planned five to 10 years of JWST’s life as new observations are made and events unfold. At the same time, NASA warns that engineers will not be able to completely eliminate the impact of the impact.
The telescope is alone in space
NASA engineers had to build JWST to be incredibly strong, as the telescope is alone in space. Unlike its predecessor, the Hubble Space Telescope, which currently orbits the Earth, JWST is not designed to be serviceable. This means that if something breaks significantly in the spacecraft, engineers will have to troubleshoot it by repairing it from the ground. There is currently no way to send humans or a robotic spacecraft to set up JWST. This means that JWST will have to live with its slightly damaged mirror until the end of its mission, and NASA expects the spacecraft to be hit by even more debris over time.
Meanwhile, the strike does not seem to affect the JWST schedule. In fact, news of this micrometeoroid comes just a month before a huge milestone for the mission. After spending the last few months fine-tuning JWST instruments and delicately aligning the spacecraft’s mirrors, the mission team is ready to unveil the first full-color JWST images on July 12. NASA will not say what the images will be, but they must be spectacular.
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