system
Given the following post, respond as if you're commenting on Reddit:
human
When the last black hole in the universe evaporates and explodes, what happens to that radiated energy?

A model of the future universe predicts that, after trillions upon trillions of years into the future, all the stars have exhausted, all matter has accumulated into black holes, and the black holes themselves evaporate. When the last black hole in the universe radiates away, there are no other structures in the universe to interact with those fluctuations. What happens to that last bit of energy? Does it simply diffuse through the impossibly vast, cold, empty universe? Does that mean that there will always be some amount of energy (and information?) that persists?
gpt
Just like most other radiation and stable particles (only a very small fraction will fall into black holes) it will just fly through the universe forever. The expansion of the universe will separate all these particles from each other.