At 8:31 am on March 20th, the fourth phase of the lunar exploration project, the Queqiao 2 relay satellite, was successfully launched from the Wenchang Space Launch Site in China by the Long March 8 Y3 carrier rocket. As a crucial link in the follow-up mission of the fourth phase of the lunar exploration project, the Magpie Bridge II relay satellite will establish a new "Magpie Bridge" between the Earth and the Moon, providing relay communication between the Earth and the Moon for missions such as Chang'e-4 and Chang'e-6. After 24 minutes of flight, the Long March 8 Yao 3 carrier rocket separated from the rocket and directly launched the Queqiao 2 relay star into the designated Earth Moon transfer orbit with a perigee altitude of 200 kilometers and an apogee altitude of 420000 kilometers. The relay star's solar wings and communication antennas were deployed normally, and the launch mission was a complete success. Subsequently, with the support of ground measurement and control, Queqiao 2 will undergo intermediate correction and near moon braking, enter the capture orbit, then enter the phase modulation orbit after orbital control, and finally enter the 24-hour lunar mission orbit, becoming the world's second dedicated relay star outside of Earth orbit after the "Queqiao" relay star, providing support for the Chang'e-6 lunar sampling mission, and relay communication services to the "Queqiao" relay star for Chang'e-4. In December 2021, the fourth phase of the lunar exploration project was approved for implementation, consisting of four missions: Chang'e-4, Chang'e-6, Chang'e-7, and Chang'e-8. Chang'e-4 was launched in December 2018, achieving the world's first soft landing survey on the far side of the moon; Chang'e-6 will be launched at an appropriate time in the first half of 2024; Chang'e-7 and Chang'e-8 will build basic lunar research stations and carry out tasks such as lunar environmental exploration. The lunar exploration project is organized and implemented under the leadership of the National Space Administration. In this relay satellite mission, the overall project is undertaken by the Lunar Exploration and Aerospace Engineering Center; The relay satellite and carrier rocket are jointly developed by the China Academy of Space Technology and the China Academy of Launch Vehicle Technology of China Aerospace Science and Technology Corporation; The ground application system is undertaken by the Chinese Academy of Sciences. This is the 512nd flight of the Long March series of carrier rockets. (Lai Xin She)