For the first time in my life I've chosen this effect. I'll be quick, I need to blow up Moon, but when I put shatter to it I can't see the moon anymore, I tweaked those settings, nothing. I can only see the trajectory of Moon's revolution I created. Any help tweaking those settings?
There are resources here that show you how to use the Shatter effect.
You description of your problem isn't very clear (Screenshots help.), but I'll venture a guess:
You haven't set View to Rendered in the Effect Controls panel for the effect. So, you're just seeing the wireframe representation of the forces and such.
Please, do us all a favor and read the documentation for features before using them and while you use them. There's a search box in the upper-right of the application window.
I started using Shatter when Brian first released it in the Atomic Power series (Or was that Atomic Energy? So long ago and so many updates!). I love it. Brian invested a full hour of Total Training VHS time trying to explain the basic operations; just the basics. Advanced applications required another two hours of material. It's a shame those tutorials aren't archived on Total Training's site or here at Adobe.
So I got three hours of material from the guy who invented the plugin and I've used Shatter on hundreds of projects since then. And every time I apply it, I look at the dozens of controls and think, "Holy crap!"
There's nothing easy about Shatter. Nothing. But it will become a favorite of yours after you invest twenty or thirty hours learning how to use it.