system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:-273 Centigrade is the lowest possible temperature.What is the highest possible/feasible temperature in the Universe?

There was a paper today at the Physics section of the Open University I attend and the author was discussing the bounds for pyrometry.Here he was postulating a system of 'virtual' particles travelling at c,and this caused a huge controversy.Of course ,no particle could conventionally attain c,but the question argued about was,what is the upper bound on temperature?
gpt
The Planck Temperature is the upper bound at which our current understanding of physics breaks down. However, even in the first moments after the Big Bang, the universe was still a few orders of magnitude away from this temperature.