The atmosphere shader seems to overlay darkness onto things in space, meaning that when you have other things in the sky, ESPECIALLY other things with atmospheres, they can be very difficult to see, and far too dark.
Note that this picture is from a modified system that puts Droo into orbit around a gas giant with a Droo clone in a lower orbit. All three objects have blue atmospheres. However, I have reduced the waveLengthMag value to 0.5 in my attempt to remedy the problem. With waveLengthMag = 1, the other celestial bodies weren't visible until you entered space.