system
Given the following post, respond as if you're commenting on Reddit:
human
If the universe is expanding at an ever increasing rate, where does the energy come from to perpetuate this speed?
gpt
This isn't a speed. Objects moving through space have a speed, but space itself does not have a speed.

It's also worth noting that, on cosmic scales, energy does not have to be conserved. By Noether's theorem, energy conservation is applicable when the physical laws of a system are time-invariant, but the universe changes over time.