Hey when playing US2 I found one annoying thing to be the lack of a basic solar system simulation with just the planets, since the default one runs pretty slow. So I ended up making my own solar system simulations with various tweaks, and I wanted to upload them here incase anyone else would like to use them. They run MUCH faster for me.
Here is a list of the simulations included in the .zip file.
1. Solar System (Only planets)
2. Solar System inner planets
3. Solar System Outer Planets
4. Solar System major moons
5. Solar System W/Jupiters moons
6. Solar System Saturn moons
7. Solar System Neptune/uranus moons
8. Solar system gas giant moons
And a few other solar system sims.