A-man.
There are several shots in AOTC or ROTS that have asteroids realistically rendered. You can grab a big variation from there, separate them and then make them a particle system. You can also use some footage elements that will give a more real tone to the logo.
The A logo would be nice to be in an either black enviroment or to a more subtle tone rather pure white.
just my feedback captain :)
-Angel