Looks great! I like how clean it is.
However, unless I'm mistaken, your lighting is coming from the above right in the scene. It's making the lighting on the earth strange even though your model has great lighting. If I were to do it, I would probably render the earth and satellite seperately with unique lighting on both. That way you could get the earth lit up more for the amount of light you have on your satellite without washing out the detail on the satellite.
btw: you guys hiring?
Maya artist here in need of work...