According to foreign media reports, on Saturday local time, NASA launched the second "wing" of the giant main mirror of the James Webb Space Telescope, making the light collecting structure reach the maximum size, which marks the full completion of the deployment of the whole telescope. The largest space telescope in history will begin the rest of its journey, reaching its predetermined orbit and staring into the universe < p > Thomas zurbuhen, NASA's deputy director of science affairs, told the Weber team after the milestone: "we have deployed a super telescope in orbit, which is a magnificent telescope never seen in the world." NASA Director Bill Nelson said: "today, NASA has achieved another engineering milestone in decades! Although the journey is not over, I joined the Weber team, breathed a sigh of relief and imagined that the future will inevitably inspire the world to break through." < p > the James Webb Space Telescope can observe the universe with infrared light, but the optical equipment and instruments on it must maintain a very low temperature to receive these weak thermal signals. Therefore, the telescope carries a five layer sunscreen cover the size of a tennis court to reflect sunlight and heat < p > however, the fully extended sunscreen is too large to fit into any currently operating rocket payload fairing, so the structure is launched in a highly folded manner. The same is true of Weber's main mirror, which is 6.5 meters in diameter and consists of 18 gold-plated hexagonal parts arranged on the central column and two flanks. Therefore, the deployment phase of the telescope is very complex < p > Mike Menzel, Weber mission system engineer at NASA's Goddard Space Flight Center, once explained: "Weber telescope has 50 main deployment tasks, and 178 release mechanisms are required to deploy these 50 components, and all designs must work. Developing Weber is undoubtedly the most complex spacecraft deployment activity we have ever done." < p > task team members said that the sunscreen cover alone has 140 release mechanisms, 70 hinge assemblies, 400 pulleys, 90 cables and 8 deployment motors. All these designs worked well during the deployment of the sunscreen cover, which took about a week to complete from three days after launch < p > all these deployment steps are carried out during Weber's driving to the final destination, which is a gravity stable place about 1.5 million kilometers away from the earth, known as earth sun Lagrange point 2 (L2). In L2, the Weber telescope can be consistent with the sun, earth and moon, allowing its sun shield to continuously block light and heat from these celestial bodies. About 29 days after the launch, that is, around January 23, Weber will start the engine and put it into L2 orbit. But the telescope is not ready to start looking < p > the mission team will still have to check and calibrate the four scientific instruments on Weber, and accurately align all parts of the main mirror to make it a single, almost perfect light collecting surface. This work is expected to take about five months. If the plan goes smoothly, Weber will start his much anticipated scientific mission at the end of June or early July, and will observe the universe for at least five years. (small) < / P > < p >