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If I wanted to create a scale model that showed the distance between our galaxy and the nearest one to us, how small would our galaxy have to be for the model to fit in one room?

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If I wanted to create a scale model that showed the distance between our galaxy and the nearest one to us, how small would our galaxy have to be for the model to fit in one room?	1
Do I actually hear anything other than the sound of my own inner ear vibrating?	1