Fire simulation and render layers

I have done a fire simulation and am having trouble rendering it. I have looked over different pages about how to render particles in blender cycles. It won’t render. I’m not sure what is set wrong in my scene.

I’m also going to put the fire on one render layer, and the planet on a different render layer and the ship on another render layer, but I don’t really understand setting up render layers either.

I’m using Blender 2.78a