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The reason is related to the fact that the laws of physics don't change over time. For more information, read the Wikipedia article, or some other source, on "Nöther's Theorem" also spelled "Noether's Theorem". Be warned - you'll need some pretty advanced math to understand all the details. But in summary, each symmetry in physics - in this case, the fact that physical laws don't change over time - is related to a conservation law - in this case, conservation of energy.

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10y ago
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Q: Why energy cannot be created or destroy?
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