Well, I lost the Blender-Files for the two planets so you'd have to take the images as they are. Concernig the sun, I'm just rerendering the image sequence, the animation is now looping, probably better suited for an animated texture. I just don't know, should I render them with an alpha channel and translucent background or with a black background (as it is now)? Also, is the Freespace-Engine capable to use this animation? It consists of 1132 frames, each 750x750 pixels. When the image sequence is useful as an texture I will upload it to a file hosting service.