A selection of images created in Motion (bottom 3) and then the top one is from After Effects.

After Effects has a Sphere effect that instantly makes it look like a planet and this image also has a colorama effect on it. The bottom 3 I did on Motion and I made the planets revolve (sort of) around the fire planet (symbolic of the sun). 

I think I like the after effects planet better as I am only looking to create the illusion of one planet not tryin to recreate the solar system.