Hi I am a newbie about this stuff. I want to do a number of things in map making. I am using Gimp v2.8.2. I have to say I don't know it as well as maybe I should. However the issues is I want to make maps for a Sci-Fi game not fantasy.

First is a map of the Stars that the game will be operating around.

Next I need to make a maps of worlds. A nice free map generator would be nice.

Any suggestions.