Share the news on November 8 with wechat scanning QR code < / P > < p > to friends and circles of friends < / P > < p > SpaceX will launch a number of satellite chain Internet satellites in Florida on November 12 local time. This will be SpaceX's first launch of a satellite chain in nearly two months, and SpaceX's first launch of a satellite chain on the east coast of the United States in nearly six months < p > < / P > < p > it is reported that SpaceX has completed 13 satellite chain satellite launch missions in the first five months of 2021, with a total of nearly 1000 satellites in orbit. However, only a number of satellite chain satellites were launched in the following five months < p > on September 14, SpaceX launched the 51st satellite chain v1.5 using laser communication into orbit on the west coast of the United States. The second batch of satellite chain satellites originally scheduled to be launched on the west coast in the middle of this month were postponed indefinitely < p > in fact, SpaceX did not determine the launch date of the satellite chain a few days ago. On November 4, a second-hand Falcon 9 rocket booster was found driving along the road of the Kennedy Space Center to the lc-40 launch pad. Since launch pad 39 has been clearly used by SpaceX to arrange the implementation of the crew-3 manned space mission, the only reasonable explanation is that the Falcon 9 rocket in transit will be used to launch the star chain satellite < p > in fact, just one day after the discovery of the rocket booster in transit, the dangerous area information released by the 45th space wing in Cape Canaveral confirmed that SpaceX planned to launch a number of satellite chains from 7 a.m. to 8 a.m. Eastern time on Friday, November 12 < p > in addition, this satellite chain launch mission is not the second launch plan of the second group of satellite chain near the polar sky, but the first launch of the fourth group of satellite chain < p > in the first phase of SpaceX's satellite chain satellite network, 4400 satellites will be launched and divided into five groups. The company divides the satellites into different groups (shells) according to different orbital heights and inclination angles. In May this year, SpaceX successfully launched a number of satellite chain satellites on the east coast, which means that the first group of satellites were launched. In September, the satellite chain v1.5 equipped with laser communication technology was launched for the first time, and SpaceX named it the first launch of the second group of satellite chain satellites. It is reported that the second group of SpaceX satellites mainly operate over the polar regions, including 720 satellites; The fourth group has the same number of satellites as the first group, with 1584 satellites < p > in addition, the third group and the fifth group have 340 and 158 satellites respectively. The operating altitude of the two groups of satellites in polar orbit is slightly different, which is likely to be the last two groups of satellites launched in the first phase of SpaceX satellite chain network < p > different from the satellite link satellite v1.0 used in the first group, the fourth group of satellites will be satellite link satellite v1.5 equipped with laser communication technology, so that the satellite link satellite can finally fully realize orbital communication, so as to reduce the demand of the whole network for satellite ground stations < p > on November 7, the SpaceX service ship Bob and the unmanned recovery ship ASOG left the port of Canaveral to prepare for the launch of the satellite chain. (Chen Chen) < / P > < p >