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Ever wanted to play God? Now you can. This little app lets you build your own solar system. You can drag the planets around, click in other places to change their velocities (the green lines), and double click to add or remove planets. You can also edit settings manually at the bottom. When you're ready, click go and see what happens!

If you have a lot of planets, your computer might slow down. Speed it up by downloading SolarSym.