I often see it attributed to dark energy. I don’t understand entropy very well admittedly, but this explanation makes sense to me. So what is the difference between the expansion of the universe and entropy?
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You can think of entropy as a measure of how much energy in a system is usuable but it is different from the total amount of energy in the system.
Say you have a cup of water with cold water at the bottom and hot at the top. Over time the temperature equalizes and the entropy increases however the total thermal energy is the same it’s it just evenly spread out in the cup now(assuming no losses).
Expansion of the universe is like if the cup over time get hotter and hotter maybe until the entire cup is boiling. Where the energy for this comes from no one really knows so we call it dark (physic talk for we don’t know not actually dark) energy.
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