The setting is pure Space Opera so the radiation deal is pretty much solved with rubber science force fields. For that matter, the temperature could also be handled by the same explanation.

I am toying with this idea of somehow demonstrating space stations and such. That would help indicate that the "colony" close to the sun is a mobile research station that keeps itself parked on the dark side of the planet. Working with straight visuals and no accompanying text can be a challenge in and of itself.

Edit: And this map is still in very early stages. It is built upon many, many layers that allow me to manipulate where exactly a planet and it's label goes.

Thanks for the feedback.