Since 2007, China has launched Change 1, two and No. three detectors in succession, and achieved lunar exploration and soft landing on the moon. The Change four has a soft landing on the back of the moon this year, the exploration and research of the topography and mineral composition of the lunar back patrol area, the exploration and research of the shallow layer structure in the patrol area on the back of the moon, the observation and research of the lunar base low frequency radio astronomy and so on. The soft landing on the back of the moon is not only more difficult for telemetry, but also more complex and difficult. Today, academician Wu Weiren, the chief designer of Chinas lunar exploration project at the China space day Beijing division of Chinas science and Technology Museum, said that the back of the moons back image, taken by Change I and Change two, shows that the back of the moon is mountainous and not flat. For example, Change three is equivalent to landing in the North China Plain. Change four is equivalent to landing in the mountainous area of Yunnan and Guizhou. More importantly, the exploration of the moons back has many unique scientific values. Wu Weiren said that the back of the moon avoided a lot of electromagnetic interference from the earth, and was situated in a quiet zone of electromagnetic waves. Only in such a clean environment can the detector detect the early waves emitted by the universe. These low frequency shortwave can help us study the origin of the universe. It is impossible to detect the front of the moon because it receives electromagnetic noise. Zheng Yongchun, a scientist at the National Astronomical Observatory of the Chinese Academy of Sciences, said.