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14-05-2023
Physics

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The CMB fits almost perfectly to a blackbody curve of an object with a temperature of 2.73K. This means thata. The temperature of the early Universe was colder than 2.73K, because the Universe has warmed with time. b. The temperature of the early Universe was 2.73K. c. This means nothing, because the Universe isn't a blackbody. That the CMB matches a blackbody curve is a coincidence. d. The temperature of the early Universe was much hotter than 2.73K, because the radiation has been significantly redshifted since it was emitted.

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