B If the universe were played in reverse, how would it differ?

What if the universe suddenly started playing in reverse, like playing a recording in reverse. Particles gain kinetic energy from heat and sound energy as they travel the opposite way, light retreats back into the sun etc. Would this universe differ in any way? Does anything not work if time were reversed?
 

kuruman

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You are asking a very complicated question that doesn't have a simple answer. You may wish to read this Wikipedia article about the arrow of time and try to figure out on your own what would happen, considering all the listed approaches and interpretations, if the arrow of time were reversed. I don't know enough to do that for you and it makes my head hurt.
 

berkeman

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