Now That We Have Already Traveled to the Interstellar Space, We Still Need to Go Back to the Middle Ages to Build Rockets.

Human civilization is highly developed and has mature interstellar navigation capabilities. However, a major disconnection disaster swept across the known star field, resulting in the paralysis of most jump star gates and the interruption of faster-than-light communications. Advanced interstellar ships became scrap metal or cages due to their reliance on complex networks and specific star gates. After the colonies in some of these galaxies lost core technological support, their technological level regressed sharply, and even returned to the farming or feudal era similar to the Middle Ages on Earth.