Thames & Kosmos 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

Build a colorful, mechanical, rotating model of our solar system!

The model uses a windup motor to set the planets in motion--no batteries required.

Explore fundamental gear mechanics and discover a special type of gear called a planetary gear.

Great for science fair projects, you'll learn about the planets' celestial orbits and tons of cool planetary facts.

Includes a built-in expansion slot should the mysterious Planet Nine be discovered!

Assembly time: 1-2 hours, Difficulty Level: Intermediate