Next, you may want to change some stuff.
As an example, I moved this splat a little bit, resized it, unchecked the point at behavior and rotated into the direction I liked.
You can see the result.
This is really just a light source in the scene (sort of) and so anything behind it (Iike the clouds) will come right through. That means a starmap that you put out there will overlay onto the planet and goof it up but the clouds will look correct.
So there are some limitations but hey, I started off knowing this was a simple and primitive method (and cheap too).
Like I said before, I'll post a scene for the sky scene and the scene for rendering the planet as well in the free stuff section. I built all of this in Carrara 8 but none of it uses any special plugins or unusual features.
I'm not completely sure but I would bet you could open these files in earlier versions of Carrara if you wanted. Bottom line though, this tutorial should work for pretty much any version of Carrara out there. The realistic sky editor showed up somewhere around version 2 or 3 but you could still use this with the old sky just as easily.