Chinese President Xi Jinping (C, front), also general secretary of the Communist Party of China Central Committee and chairman of the Central Military Commission, and other senior leaders including Li Keqiang (3th R, front), Li Zhanshu (3rd L, front), Wang Yang (2nd R, front), Wang Huning (2nd L, front), Zhao Leji (1st R, front) and Han Zheng (1st L, front) pose for a group photo with representatives of space scientists and engineers who participated in the research and development of the Chang'e-4 mission at the Great Hall of the People in Beijing, capital of China, Feb. 20, 2019. [Photo/Xinhua]