For a while I've been trying on the mod forum to "delete" the sky so the outside world is covered in fog like how it should look like.. simply said.. the sky should have the same color as the fog...
So far it worked... I made the cloud textures transparant, and through the ini i gave the sky domes the same color as the fog and deleted the moons...

but there's one odd thing.. during clear (the weather type) nights these ... nebula's appear in the sky:

http://imageshack.us/photo/my-images/706/morrowind20110612140303.png/

there are always three of them.. including this one.. another cloud-like-thingy and one wich is like this big stripe.... and they always "float" on the same location in the sky...
Now the strange part is.. I've no clue what they are.. in the .ini file I've found no reference in the weather section to them... someone suggested that they are nebula's but all the nebula's textures I have.. I've already made completely transparant....

If someone know's a direct solution you're welcome... but my biggest question is actually here... where can I find the place (either the CS or the .ini file or somewhere else) where is decided which textures are going to fill up the skydome ingame?