[MyTwoCopperCoins]

A cyclic universe is nonsensical if the universe has always existed — because the laws of thermodynamics would ensure that the amount of energy in an infinitely existing universe would be 0.

Could you please elaborate?

[rom]

Basically, there is always energy lost in any work and is not 100% efficient (such as in the fusion reaction of a star, energy lost in an engine due to friction, etc...)

Therefore the universe is always losing potential energy (you’ll probably know this as entropy). So an infinitely existing Universe would be expected to have 0 energy left in it. Since our Universe doesn’t have 0 energy, it has not always existed.

Interestingly enough, the Bible states that our Universe is subject to decay (entropy).