1. How does the darkness of the night sky tell you something important about the universe? 2. How…

1. How does the darkness of the night sky tell you something important about the universe? 2. How can Earth be located at the center of the observable universe if you accept the cosmological principle? 3. Why can’t an open universe have a center? How can a closed universe not have a center? 4. What evidence shows that the universe is expanding? What evidence shows that it began with a big bang?  

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