The reporter learned from the Center for Space Application Engineering and Technology of the Chinese Academy of Sciences on the 16th that my country has successfully built a three-star constellation of Earth-Moon space composed of three satellites, and will focus on the long-distance retrograde orbit of Earth-Moon space (DRO) for in-depth scientific research.

　　Earth-moon space is a new airspace that expands outward from low-Earth orbit and near-Moon orbit, and can reach up to 2 million kilometers from the earth; compared with low-Earth orbit space, its three-dimensional space range has expanded by thousands of times.

　　The long-distance retrograde orbit is a lunar orbit that is contrary to the direction of the moon's revolution. A typical type is about 70,000 to 100,000 kilometers away from the moon. It is a "transportation hub" connecting the earth, the moon and deep space. It is called the "natural good harbor" of earth-moon space. Exploring this "natural good harbor" will provide strong support for the development and utilization of earth and moon space and the forefront of space science.

　　In February 2022, the Chinese Academy of Sciences launched and implemented the Class A strategic pilot project "Exploration and Research on Earth-Moon Space DRO", and proposed independent innovative, novel and unique, concise and feasible large-scale three-star constellation planning for earth-Moon Space.

　　On February 3, 2024, the first experimental satellite of the pilot project, DRO-L, successfully entered the solar synchronous orbit and carried out related experiments normally.

　　On March 13, 2024, the DRO-A/B binary star assembly was launched at the Xichang Satellite Launch Center. The launch vehicle's first and second stage flight is normal, but due to abnormal flight of the above stage, the satellite did not accurately enter the predetermined orbit.

　　In the event of abnormal launch, my country's scientific research team successfully implemented multiple perigee orbital maneuvering remediation controls. After a voyage of nearly 8.5 million kilometers, the DRO-A/B double star assembly finally entered the predetermined orbit accurately.

　　On August 28, 2024, the DRO-A/B satellite assembly was successfully separated. On August 30, DRO-A/B satellites and DRO-L satellites successfully built K-band microwave inter-star measurement communication links, verifying Samsung's interconnected networking model, which marks the world's first DRO-based Samsung constellation to successfully deploy in orbit.

　　Researcher Wang Qiang, deputy director of the Space Application Center of the Chinese Academy of Sciences and deputy commander of the pilot special project of Earth-Moon Space DRO exploration and research, introduced that after the successful networking of DRO-A, DRO-B, and DRO-L, the Samsung Internet has continued to carry out a number of cutting-edge scientific experiments and new technology experiments to promote the exploration and research of Earth-Moon Space DRO to achieve three "first international" important results: the first time the spacecraft DRO is realized into orbit by low energy consumption; the first time the 1.17 million kilometers K-band inter-star/satellite microwave measurement communication link is verified, breaking through the key core technology bottleneck of the large-scale constellations of the earth-Moon Space; the first time the new quality capability of Earth-Moon Space tracking satellite tracking satellite orbit navigation is verified.

　　In the future, the scientific research team will further study the complex and diverse three-body orbital problems of the earth and moon space, understand and master the evolution laws of the earth and moon space environment; use the long-term stability of DRO, deploy an E-18-order atomic photoclock, support the research on basic scientific issues in the fields of quantum mechanics, atomic physics, etc., and carry out higher accuracy verification of general relativity. (Reporter Lu Chengkuan)

[Editor in charge: Zhu Jiaqi]