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| Olber’s
Paradox: |
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| Why is the night sky dark? |
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| • | If
we are in a |
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| universe
which |
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| extends
far enough |
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| then |
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| • | In
any direction we |
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| will
just be looking at |
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| the
surface of some |
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| star. |
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| If
so, in any |
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| direction, why isn’t |
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| it as bright as the |
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| surface of a star? |
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