
14 - Why Does Time Move in One Direction?
Why This Universe?
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The Importance of Symmetry in Physics
Physicists would say that these laws of physics have a feature called time reversal symmetry. If you replace T with minus T in any of these equations, you get the same thing you started with. There are a lot of kinds of symmetries embedded into the laws of physics. Time reversal symmetry is just one example. Throughout the 20th century, we've learned about other sorts of symmetry.
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