Just curious.
I'm an artist, so not a potential customer, but I would suggest you animate them for others.
Planets work well without being animated, but stars are big burning balls of gas, so probably resolve better with some animation. Having those currents rolling around on the surface a bit, and little flares bubbling off the sides.
Realistically, of course these changes are slow since stars are so big, but for effect, sometimes what looks right is better than what is.