In this activity, you will use the interactive simulation from the Build Your Solar System Simulation (by SimPop) to explore how solar systems are built, how planets orbit their star, and what happens when you change the positions or number of bodies. You’ll drag and drop planets and comets around the star, observe how they orbit, reposition or remove them, and answer questions based on your observations. This simulation helps you to see how orbiting works, why distance from the star matters, and what stable and unstable systems look like. Answer key included