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*21. Uniformity of the cosmic Microwave Background. The temperature of the cosmic microwave background differs by only a few parts in 100,000 across the sky. Compare this level of uniformity to that of the surface of a square table that is 1 meter on each side: How big would the largest bumps on that table be if its surface were smooth to 1 part in 100,000? Could you see bumps of that size on the table’s surface with your naked eyes?
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The Cosmic Perspective Fundamentals (2nd Edition)
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