Answer to Question #69708 in Astronomy | Astrophysics for SANJAY

Question

If the temperature of the background radiation today is 3 K, at what time after the
birth of the universe was the temperature 10^15 K. Take the age of the universe as
15 × 10^9 years.

Answer 1

Please see at (https://en.wikipedia.org/wiki/Chronology_of_the_universe) the table with the universe chronology. The given temperature was somewhere between inflationary epoch, electroweak epoch and quark epoch or between 10^-32 and 10^-12 second after the Big Bang.