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Originally Posted by infamous
Why do I see a paradox developing here. Shortly after the Big Bang the universe was incredibly hot after which it began to cool. The second law tells me that in a closed system entropy can only increase but, this explanation says that because the universe is cooling, entropy is decreasing. It's becoming clear to me that I'm missing something about the defination of entropy.
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Take my answer with a grain of salt, as I know almost nothing about mixing cosmology with thermodynamics. Taking a guess, I think its tough to define the universe as a thermodynamically closed system, as it is constantly creating space, which has an essentially 0 energy density. The universe cools, I would guess, by sharing its heat with this new space.
-Will
