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how do we really know that energy lives forever

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We can never prove energy lives forever, since it would take an experiment that lasts forever. However, over very long periods of time nobody has seen it vanish (it can change form, like going from solid to heat, etc.).
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There a law in physics (I forgot what it was called) that says energy can't be created or destroyed, and if it can never be destroyed, then it, well... can never be destroyed.
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The law of conservation of mass (the law of conservation of ebergy) says matter or energy can't be created or destroyed.
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that's intrestin
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we havent seen it vanish through long periods of time, people dont really live forever so i cant answer your question



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