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Q: Why does the entropy of the universe always increase, and what is the heat death of the universe?
Physicist: The increase of entropy is just how a scientist talks about the fact that the universe tends to do the most likely thing. One of the things that increasing entropy does is to spread out heat as much as possible. The same, very cold, temperature. Both the burning of fuel (mostly through fusion in stars) and the distribution of heat are processes which increase entropy. Heat death is the point at which the universe has finally settled down completely (or almost completely), and nothing interesting ever happens again.
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