This map is going to be of the Versi system, the Capital and Home System of the Versis Star Imperium.
I'm using GIMP 2.6.
I made the Sun by making a layer that was 500x500 px and then filling it with the plasma script, then using the colorizing tool made it all a bright yellow. I then used the map object script to make it a sphere, then ran the drop shadow scripted to make the glow; repeating it several times increasing the radios each time. I then merged all the shadow layers and moved that layer above the sun layer and adjusted the transparency until it look right.
The blue line is a guide to place the planets along, so that I get a nice curve to their placement.