According to foreign media reports, NASA shared the latest progress in the deployment of the James Webb Space Telescope (JWST) on Saturday, local time, indicating that it has successfully completed the mirror segment alignment and image stacking < p > < / P > < p > the main mirror of the James Webb Space Telescope consists of 18 separate parts, all of which have been segmented and aligned as of Saturday. After that, the imaging of stars and other celestial bodies will not appear the previous 18 ghosting phenomena, but generate a unified single object image. Although several focusing steps are needed, the commissioning of the telescope is getting closer and closer to the end < p > after launch at the end of 2021, the focus will immediately be on deploying all the components of the James Webb Space Telescope, which must be fixed in the launch vehicle in a compact configuration to facilitate launch. The deployment process includes adjusting and extending the direction of the primary mirror, reducing the position of the secondary mirror, and deploying a multi-layer sunscreen that helps keep the imaging hardware cold < p > What's exciting is that all this went very smoothly < p > at present, NASA's lens adjustment has entered a new stage called "segment alignment" and "image stacking". After moving 18 scattered light spots into the iconic hexagonal structure of the James Webb Space Telescope, the team optimized the image of each mirror segment by making small adjustments, and changed the alignment of the secondary mirror. Completing this process (segmented alignment) is a key step before overlapping the light from all mirrors so that they can work together < p > once segment alignment is achieved, the focus reflected by each mirror will be stacked together, transmitting photons from each segment to the same position on the NIRCam sensor. In a process known as image stacking, the team has tried to activate six mirrors and ordered them to redirect light to overlap until all starlight points overlap each other < p > Lee Feinberg, director of optical telescope components of the James Webb Space Telescope Project at NASA's Goddard Space Flight Center, said: "We still have a lot of work to do, but we are increasingly satisfied with the results we see. Years of planning and testing are paying off, and the team is very excited to see what will happen in the coming weeks and months." < p > although the image overlay puts all the light from a star in the same position of the NIRCam detector, the lens still plays the role of 18 small telescopes rather than a large telescope. Now, these lenses need to be aligned with each other with an accuracy less than the length of the light wave. To do this, engineers will image the spectrum of light, looking for slight shifts in imaging positions at different wavelengths. Thus, it is possible to calculate which direction the mirror must move most appropriately, which will gradually make the light spots clearer and more concentrated in the next few weeks. (small) < / P > < p >