Share with friends and circles of friends with wechat scanning QR code < / P > < p > on February 25, after NASA worried that the satellites deployed in the "star chain" plan of SpaceX's satellite internet project would increase the risk of spacecraft collision, thus affecting space missions. SpaceX responded on Tuesday that "at present, the reliability of satellite network is higher than 99%." < p > SpaceX said in an article entitled "SpaceX's methods to achieve space security and sustainable development": "after more than 2000 satellites have been deployed, the reliability of the satellite network is higher than 99%, and only 1% of the satellites fail after lifting the orbit." < p > SpaceX plans to build a giant satellite network composed of more than 42000 satellite chains, so as to provide low-cost Internet services to remote areas around the world. It launched another 46 satellite chains on Monday < p > SpaceX said that it currently has the ability to manufacture 45 satellites a week and launch 240 satellites in a month < p > earlier this month, NASA expressed concern about the idea of SpaceX CEO Elon Musk's plan to launch another 30000 satellite chains. In a letter to the Federal Communications Commission (FCC), NASA said the plan could cause "serious congestion", increase the possibility of collision and interfere with NASA's space mission < p > FCC is reviewing the license application submitted by SpaceX for the second generation satellite Starlink Gen2. SpaceX obtained the preliminary permission to launch 12000 satellites in 2018 < p > NASA said in the letter that there are 6100 trackable objects in low earth orbit. But according to Musk's plan, this number will increase fivefold. Although NASA did not explicitly oppose the FCC's licensing of the second-generation satellite chain, it requested more information on the satellite chain project and its "long-term sustainability impact on the space environment" in the submitted document < p > SpaceX said in its response that additional measures had been taken to prevent spacecraft collisions, including the development of "advanced avoidance systems". If "the probability of collision is greater than one in 100000", the system will perform avoidance operation < p > SpaceX also said that before putting the satellite into orbit, the satellite will be put into low altitude operation to verify whether the satellite is in good operation < p > SpaceX said it would adhere to higher standards than those proposed by the FCC and take the satellite out of orbit within five to six years, rather than 25 years later. SpaceX said the latter time standard was "outdated". SpaceX also said it was the only satellite operator to provide daily health reports of satellite networks to the FCC < p > in addition to the concerns raised by NASA, astronomers often complain about the star chain satellite network. They said that the increasing number of satellites could have a negative impact on astronomical research. At that time, musk said on personal social media that the star chain would not "prevent new discoveries or change the characteristics of the sky". (Chen Chen) < / P > < p >