ANSWERS: 1
  • That's a good question. I think the answer is that the current estimate of the age of the Universe was not arrived at via one simple calculation, but by creating a complex mathematical model which takes into account many different effects and lines of evidence, such as relativity, the expansion of the Universe, the cooling of the Universe (whose evidence is the Cosmic Microwave Background radiation), red shift, and so on. You can find a lot of detailed information, and jumping off points in Wikipedia's "Age of the Universe" page.

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