NASA’s James Webb Space Telescope (JWST) has just reached an important milestone in passing environmental tests before launch. Foreign media reported that the agency and the main contractor (Northrop Grumman) carried out acoustic and sinusoidal vibration tests on the assembled Weber space telescope for several weeks to determine whether it can withstand the severe test during rocket launching and entering orbit. As a seemingly simple but important development step, the Weber space telescope, as a rocket payload, needs not only to be able to work stably in the target environment, but also to withstand the noise and vibration test when the rocket flies out of the earth’s atmosphere. It is reported that JWST is the largest space telescope built so far in terms of scale and complexity. The gold-plated primary mirror is 6.5 meters (21 feet) in size, folded into 18 sets of hexagonal 1.32 meters (4 feet) in diameter before extending in space, and will eventually operate at extremely low temperatures of – 223.2 ° C (- 369.7 ° f). < p > < p > according to the plan, JWST will travel to L2 Lagrange point 1.5 million kilometers (930000 miles) from the earth in October 2021 by Aliana 5 rocket. Here, the gravity of the earth and the sun is in balance. During the test period, JWST was placed in the acoustic test room of Northrop Grumman company, where it was subjected to the high frequency oscillation sound pressure test of more than 140 dB to simulate and evaluate the impact of rocket launch on its hardware, scientific instruments, structure and electronic equipment. < / P > < p > next, the JWST was moved to another room to be tested on a low frequency sinusoidal shaking table to simulate the effects of the expected vertical and horizontal accelerations. < / P > < p > finally, Northrop Grumman said that they would also conduct a comprehensive assessment of the five layer sunshade, the primary mirror deployment mechanism, and the entire system before packaging the JWST to the south. Global Tech