How about baking a cake in a bowl...then use the mini ball pan for planets and the ball pan....for ...gees now I can't remember which is the biggest planet.....sad....but you could put them on a round board covered in dk blue foil...sun in the middle and the planets around it....whaddya think?
Cheers,
]Shirley
I agree with baking in pyrex bowls and mini-ball pans. Mise en place bowls are tempered glass and would work very well -- see picture at the following link:
http://www.ashtongreen.com/product.dhtml?prod=R120&pres=1&fc=RBW
You may want to consider airbrushing, as the rest of the planets have cloud covers so dense that you cannot see land.
FYI - Jupiter is the largest planet.
Theresa 
I did a rocket ship cake for an 8yr old last year. I put his picture in the window so it would look like he was the astronaut.
I posted a picture in my photos
Barb
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