Beijing learned from the National Space Administration on December 3 that at 23:10 on December 3, the chang’e-5 lander ignited on the lunar surface. After about six minutes of operation of the 3000 Niu engine, the lander carrying the lunar soil was successfully put into the planned orbit around the moon, successfully realizing China’s first take-off of extraterrestrial objects. According to experts, unlike ground take-off, the lunar take-off of chang’e-5 is not equipped with a mature launch tower system, and the lander is equivalent to the “temporary tower” of the riser. There are some problems in the take-off of chang’e-5, such as the uncertainty of the initial datum and attitude of the take-off platform, the limitation of the engine plume diversion space, the difference of the Earth Moon environment, and so on Constellation, after the lifter takes off, it needs to be assisted by ground measurement and control, with the help of its own special sensors to achieve autonomous positioning and attitude determination. < / P > < p > before ignition and take-off, landing on the assembly to realize the deployment of the lunar flag and the unlocking and separation of the lifter and lander. The launch of the national flag is China’s first “independent display” of the national flag on the surface of the moon. According to the return image, the five-star red flag is particularly bright in the sunshine. < / P > < p > after ignition and take-off, the risers go through three stages: vertical ascent, attitude adjustment and orbit entry, and enter the scheduled orbit around the moon. Then, the lander will rendezvous and dock with the lunar orbiter assembly, and transfer the lunar sample to the lander, which will wait for the appropriate lunar to ground incident window and be ready to return to earth.