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I once did a scaled solar system walk with my boys. The entire solar system compressed into a 5km walk. That was fun. And eye-opening. It's best to start at Pluto, otherwise all the excitement happens at the beginning.
It's also fun to think about relative angular size for planetary observation. For example, if Jupiter were the size of a grapefruit, how far away would it have to be to have the same angular size? I'm sorry, I can't remember the answer right now, but i think it was like a kilometer?
Cheers,
Markus
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