we have no evidence that the universe’s overall entropy is actually increasing. It could be just a local phenomenon, like a cold snap in a warming global climate. Secondly, the second law of thermodynamics only applies to closed systems whose total energy remains unchanged – and again, it is far from clear this applies to the universe. “Is the universe in a box?” asks physicist Julian Barbour at the University of Oxford. “It doesn’t seem plausible. All the evidence is that it’s expanding without limits.” If it is, restrictions based on entropy probably don’t apply.

we have no evidence that the universe’s overall entropy is actually increasing. It could be just a local phenomenon, like a cold snap in a warming global climate. Secondly, the second law of thermodynamics only applies to closed systems whose total energy remains unchanged – and again, it is far from clear this applies to the universe. “Is the universe in a box?” asks physicist Julian Barbour at the University of Oxford. “It doesn’t seem plausible. All the evidence is that it’s expanding without limits.” If it is, restrictions based on entropy probably don’t apply.