Thanks Michael.
I worked more for the big rock. That is OK i think too.
The others are all the same rock actually. So only 1 rock for all the debris other then the big one.
Well there is a different smaller one too but that is hard to be seen in the scene
That smaller one worked better in another try but here the general look is better so i don't bother much.
I learned so much in this animation project it is kında funny.
Knowing-reading is one thing but trying to make is the best teaching method as i saw in this project.
In the scene above for example i should have used different passes-layers (all the time actually).
I wanted to control the look of the planet and the rocks separately after the render finished.
But i didn't rendered that way. So i had to compromise.
The rocks should be more bright from the sunlight for example.
But i think in the finished animation it will be less obvious at least for the non vfx viewers.