Orbiting Solar System Stem Kit ; Build A Rotating Solar System Model ; Planets Revolve Using A Windup Motor ; Explore Gear Ratios ; Science Fairs ; Difficulty Level Intermediate

Set the planets in motion with a flick of your wrist! Build a mechanical model of the solar system including the sun and eight planets (also known as an orrery), wind it up, and watch the planets revolve around the sun. Assemble this complex machine using snaptogether plastic parts to learn how the gears and windup mechanism work to spin the model. Detail each planet with colorful, realisticlooking printed planet graphics. Discover how a special type of gear called a planetary gear is used to simulate the mesmerizing motion of the solar system. Learn about the order of the planets, their relative sizes, their rates of revolution around the sun, their appearance, and other planetary facts. Bonus: Theres a builtin expansion slot in case the mysterious Planet Nine is discovered! This kit includes fullcolor stepbystep illustrated assembly instructions.