The scale of the Solar System would require you to visualize the bodies as much larger than their true size in order to see everything on one screen. If the Sun is 1 pixel, all other bodies are way smaller than a pixel, and Neptune is 3000 pixels away. And of course, you'd probably want to speed up the simulation speed.
Also, how hard would it be to set an initial state of our current solar system? Teachers could set up scenarios for students to interact with, and allow students to collaborate.
Maybe as simple as an output/input of textual data for saving & restoring state? i'd love to try model our current solar system, and see if i can get something to mars with just an initial trajectory.
see:
http://en.wikipedia.org/wiki/Interplanetary_Transport_Networ...