How come there isn’t a conflict between the first law of thermodynamics and the theoretical scenario of the Heath Death theory?
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No one else has actually answered this correctly. The reason there’s no conflict is that in the universe, energy is not conserved and it doesn’t need to be. The law of conservation of energy comes from [Noether’s theorem](https://en.wikipedia.org/wiki/Noether%27s_theorem), but Noether’s theorem only applies to a time translation invariant universe. What that time translation invariance means is beyond the scope of this question – all you need to know is that the universe is *not* time translation invariant, which means Noether’s theorem, and thus the conservation of energy, does not apply.
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