DD1 has been really interested in learning about the solar system for half a year or so now. I have not been able to explain things so that she understands, though, not with books, drawings, or the internet. 
She's starting to get really frustrated. I'll think we have a concept down and then we'll have a conversation like this:
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(We walk into our house, home from the store, where we just started again on the whole subject in the parking lot because she wanted to understand why the moon was a tiny sliver.)
DD: "Is this Earth, still?"
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I was thinking a real visual, dimensional, physical representation would make it a lot easier for her to understand. When I looked it up, there are sooo many out there. Any favourites? I would prefer not to but styrofoam...
