China News Service, May 17 According to the official Weibo news of China's lunar exploration project, the Chang'e 4 lander and the "Yutu 2" lunar rover ended at 3:25 on May 17 and 11:53 on 16th, respectively. In the cold and long moonlit night, it was awakened by the light and ushered in the 18th day of work. May 17 was also the 500th Earth Day on the back of the moon when Chang'e 4 landed.

　　The "main achievements" in the 500 days include: "Yutu 2" lunar rover has a total mileage of 447.68 meters and is currently 292 meters from the lander. During this period, scientific detection tests such as rock detection, rut detection, and impact crater detection were carried out; Radar in-situ detection data reveals for the first time the geological layering structure within 40 meters underground of the landing area on the back of the moon, and expounds its material composition and evolution mechanism; using the in-situ spectrum detection data of infrared imaging spectrometer, successfully reveals the back of the moon The composition of the material has verified that the lunar mantle is rich in olivine, which deepens human understanding of the formation and evolution of the moon; using neutral atom detectors to detect the energy atoms of the moon ’s surface environment, we have obtained energy-neutral particles on the moon The surface flux energy spectrum confirms that the energy of the energy-neutral particles has a strong correlation with the velocity of the incident solar wind.

　　In order to meet the requirements of the first Mars exploration Tianwen-1 mission, it is necessary to adapt adaptively to the ground communication measurement and control facilities. To this end, during this day and night, Chang'e 4 lander and "Yutu 2" lunar rover will carry out in-situ detection, waiting for the next stage of instructions.

　　Based on the data of the panoramic camera stitching image and DOM image of the LET01704 point on the 17th day of the month, at a distance of 3 meters southwest of the current position of the "Yutu 2" lunar rover, a small diameter of about 1.3 meters and a depth of not more than 20 cm was found. There are materials with high reflectivity in the center and southeast of the pit, small pit, which is obviously different from the brightness of the surrounding lunar soil. After the communication resources are restored, the infrared imaging spectrometer mounted on the "Yutu 2" lunar rover will detect the specific area of ​​the small pit.