Quite a challenge for you!
I hosted my daughter's 10th birthday last year and turned it into an astronomy party. Views of saturn are always a winner. But the surprise hit was illustrating the scale of the solar system using a roll of toilet paper. It involves counting by reference to squares of paper eg Mercury is located 2 squares from the sun, Venus 4 squares etc. We started with Mars within the living room and ended up with Neptune out the front gate and about 10 metres down the street. You can find this on the web - it cracked up my girls
Pete
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