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In the fictional world of A1900, people's needs are increasing and the resources on the ground are close to drying up. In 1925, several Ark spacecraft with light-year speeds on the ground continuously headed to a planet 137 light-years away. In 2025, the alternative planet plan will be basically established. Under the reform of new forces, new industries and space shuttles provided employment opportunities for the productive forces at that time. At the same time, greater threats were gradually approaching. . .