check it out at [url]http://members.fortunecity.com/guilpain/[/url]
It's a kind of help for those who wants to make their own add-ons. You can find guides about the ssc file format and the files stars.dat and galaxies.dat, and you can download all the addons I did.
It is mainly in french for now but i'm working on the english translation.
If you have any comments or suggestions, send me an e-mail : t_guilpain@hotmail.com