Thanks, Ravells. I added the black stroke because there are so many layers of bright colors I ended up with a lot of things crossing and getting lost in each other.

I should probably have mentioned, BTW, that I did the initial layout of this map in Illustrator by bringing in a blown up scan of a map from a fabulous ST star charts book my friend loaned me and drawing the stars, grid lines, etc. over that. Then I imported those into Photoshop and added color, text, etc. I tried it in PS at first but just couldn't make a start on the look I wanted to get. AI helped for some reason...even though it was just for drawing circles and lines.