What is the hottest temperature the universe has ever been?

1 Answer
Jun 20, 2017

It is thought that the hottest the universe has been is 10^32K.

Explanation:

The hottest the universe has been is 10^(-42) seconds after the Big Bang when the temperature was 10^32K. That temperature can never be achieved again unless similar conditions occur.

It is thought that the fundamental forces separated at a temperature of about 10^28K. We can never approach those temperatures again.

So, the temperature just after the Big Bang of 10^32K is the absolute hot as far as our universe is concerned.