system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Is there a maximum hot?

I know the maximum cold is literally no heat energy, absolute zero, but is there a highest possible temperature in the way that speed has the upper limit--as far as we know--of light?
gpt
Theoretically no.

However, technically you could only attain a temperature as high as the energy of the universe would allow.  Something like the exact moment of the Big Bang would be the hottest temperature that could ever be achieved in the universe.  This is called the Planck temperature which is the highest theoretical temperature you can achieve before the temperature starts to cause conventional physics to begin to break down.  But this doesn't occur until 1.416785(71)×10^32 kelvin so we have a ways before we get to that temperature.