Solar System Simulator
is the advanced version
of Orbit Game :-OG

Solar System Simulator Requires
you to put up to 9 planets into orbit.

With Orbit Game :-OG,
its just 1.

If you have not played
Orbit Game :-OG, then
Solar System Simulator
is likely to be a bit too
tricky for you.

Download Orbit Game :-OG
Download Solar Sim 2

You can install both at
the same time if you like
:-j