To learn more about the solar system and for instructions on remixing this project, check out our webpage: https://outreach.phas.ubc.ca/phenomenal-physics-astronomy-at-home/challenge-no-3-build-your-own-solar-system/ Go into the code to set the orbital radius for the planets, and adjust the mass of the sun. How does the movement of the planets change? Duplicate the planet sprite to add your own planets! The comet can have its semi-major axis and eccentricity adjusted. Did you notice that the comet moves fastest when its closest to the sun? Why should this be?