ok....thx....now what is the max amount of star systems...i know it's moddable....but what is the pre-made max star system amount.....not in multiplayer in SINGLE PLAYER
well there isnt a definite answer, but lets do it this way.
currently the largest map is a huge random which has 5 stars (I think the scenario map aerelian sector has even 6).
however this is only for this beta, as far as I heard, before there was a slider or star picker where you can do many more combinations of stars and planets. I'm only in since beta 3 so I never saw this, but I think you could do it up to 10 stars there ingame, not sure though. this enhanced modability is said to return in beta 4 so if you wait a little longer we can give you a much better answer.
apart from copying an existing random and changing a few values (which is all the modding you need to do to play any random type map size) that's all I know.