Ok then, how do you structure it though? Like is it in its own folder or in the object’s folder?
Wiki info material that can be distributed with an addon it's a feature that will be available in 0990 version.
it will have to be placed in a "locale" folder existing along the existing "catalogs", "models" or "textures", named "<WhateverYouWant>-eng-db.cfg" for english wiki, "<WhateverYouWant>-ger-db.db" for german, and so on.
With the 0980 version the only way you can pass your custom wiki info is to write your description by editing the wiki, make sure to deselect "Real Object" tag so it will be saved in a "user-eng-db.cfg" file , then distribute that "user-eng-db.cfg" file with your addon.
I know, it's complicated.
Hmm how can i create a dark nebula?
See the chapter manual Creating a Deep Space Object
. SE should use the alpha channel of a texture to calculate the dust in custom nebulae.
I suggest to copy and extract NebulaeTex0980.pak from \data\textures\nebulae (it's a renamed .zip file), and NebulaeModels0980.pak from \data\modules\nebulae, so you can see the script structure of the existing nebulae in SE.