[Mirona Thetin]

Well, i dont think that it matter if there is a sun in the system or not. I tried to add a RW in a system with sun and w/o sun ant it worked fine to add a new RW with whatever atmosphere or planet type.
However i have noticed that editimg an existing RW (or other planet) to an other atmosphere, planet type or planet size will become valid only if one select a new picture, even thought RW of any atmosphere and planet type have all the same picture.