China marked the conclusion of its three-step lunar exploration program on Dec. 17 as the returner of Chang'e-5 brought back lunar samples. It was part of a series of major scientific and technological achievements China has made over the past year, which also include the launch of Mars probe Tianwen-1, the completion of the 10,000 meter sea trials for the manned submersible Fendouzhe and its return to port, and the development of quantum computer prototype "Jiuzhang." (Xinhua/Zheng Yue)
