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How Big is the Universe? And How Do You Know?
A precocious eleven year old girl asks me how big is the universe. I tell her that the universe is huge. In fact, it is very very very big. Of course this does not help her understand. It is hard for us to understand how big the universe really is. The little girl then tells me she knows the country is big and she knows that her home state is big. I ask her to imagine with me for a little bit to imagine how big the universe is and how I can know for sure....
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