[Xrati]

Nope, just finished trying to create a sun in a nebula and it doesn't work! BUT that still doesn't mean if your using an edited .txt files or mods for the game that some changes may allow you to end up doing it!
Also I generated a couple of maps and discovered that the sight modifier is random. I had a green Neb. at 4 and a red at 3. Soooo it must be part of a random generation unless the mod your using has again made changes that effect the generator. I forget which .txt file is used for planet generation, I think it's SystemTypes.txt that controls the map generator.