In the following article it is stated:

https://ned.ipac.cal...ey/Kinney3.html

*1. **T* ~ 10^{15} K, *t* ~ 10^{-12} sec: Primordial soup of fundamental particles.

*2. T* ~ 10^{13} K, *t* ~ 10^{-6} sec: Protons and neutrons form.

*3. T* ~ 10^{10} K, *t* ~ 3 min: Nucleosynthesis: nuclei form.

*4. T* ~ 3000 K, *t* ~ 300, 000 years: Atoms form.

*5. T* ~ 10 K, *t* ~ 10^{9} years: Galaxies form.

*6. T* ~ 3 K, *t* ~ 10^{10} years: Today.

A. How did we estimate the ratio between the temp and time?

B. What was the size of the universe at those phases of time?

**Edited by davdan, 04 June 2017 - 10:29 AM.**