I am still very new to decorating and am making my 2 year old a sphere moon cake. I will be placing a RKT shuttle orbiting the moon and am not sure which surface for the cake will hold up better? Buttercream or fondant? I would also like to put craters on etc. Just thought I would ask for advice or tips.

Please use fondant. Don't let anyone (and I know someone will try....grrrrrrr) to talk you into BC for that. Shading, making the craters, etc., will look MUCH nice with fondant. There. That felt good. Good luck!

LOL. Thanks Jamie I was thinking along the same lines but just wanted to make sure.

Can't wait to see it, it sounds really cute!