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Question: 

The scale factor of the universe (average distance between galaxies) at any given time is believed to have been inversely proportional to the absolute temperature. Estimate the size of the universe, compared to today, at

  1. $t = 10^6 \textrm{ yr}$,
  2. $t = 1 \textrm{ s}$,
  3. $t = 10^{-6} \textrm{ s}$, and
  4. $t = 10^{-35} \textrm{ s}$,

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 
  1. $3 \times 10^7 \textrm{ ly}$
  2. $3 \textrm{ ly}$
  3. $0.03 \textrm{ ly}$
  4. $0.3 \textrm{ m}$

Giancoli 7th Edition, Chapter 33, Problem 36

(1:47)

Chapter 33, Problem 36 is solved.

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