I was sent this link
http://joshworth.com/dev/pixelspace/pixelspace_solarsystem.html You ought to try it. It sets up a scaled diagram of the Solar System based on the idea that the Moon is the size of one small pixel on your computer screen. You have to scroll right with the right arrow on your keyboard to navigate out through the Solar System. It gives a clear idea of just how empty the Solar System really is. I love the humour. Apparently the number scale along the bottom works in Google Chrome but not Internet Explorer. Have fun!