This mechanical solar system model features a windup motor that powers the rotation of the planets without requiring batteries. The kit allows users to assemble a colorful, gear-driven representation of the solar system while learning about planetary orbits and gear mechanics, including the function of a planetary gear. Designed for intermediate builders, assembly takes approximately 1-2 hours. The model includes an expansion slot to accommodate a potential future discovery, such as Planet Nine. Suitable for science fair projects, it provides an engaging way to explore planetary motion and basic engineering principles.