Cool image.
I won't bother you with scale considerations, but I have a few astonomic 
remarks:
- Where is mercury ? (or where is Venus ?) There should be two planets 
within Earth's orbit.
- Mars has two small satellites.
- Jupiter has some 13 or 14 satellites, but it's true that it wouldn't 
look so nice to model them all. Saturn has a lot of satellites too in 
addition to the rings.
- Uranus and Pluto are missing, they are a bit further away but you 
could put them in the upper right corner.
- The sun shouldn't have a shadow on it as it is itself a high intensity 
light source, you should try to give it a ambient of 1.0 and even 
simulate the intense light with some media. You should also set the it 
to be the main light for your scene.

I know that you just want to model the asteroid belt, but I can't really 
say nothing when whole planets are missing.  :-)

As for the belt, you can try a lot (1000-10000) of little spheres, but 
that will be difficult to animate, so you can try some spheres and a 
toric media to simulate smaller particles. If you find spheres too 
regular you can use isosurfaces.

JC



> See "Making an Asteroid Belt" (30 Jun. 2003) at p.g.
> 
>    Sputnik
> 
> 
>

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