Oh, it's definitely not to scale. I had the same thought about the planets knocking into each other - billiards!

I worked hard to get an asteroid belt that I liked, so thanks.

What I'll probably end up doing is just a line diagram type of thing for the planetary orbits, with very small colored spheres to represent the planets, then have boxes on the sidebars showing the pictures of the individual planets, moons, artificial stuff, etc.