What is total amount of energy and mass in the universe?

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The total amount of energy and mass in the universe does not change. Neither energy nor mass (matter) can be destroyed. One kind of energy can be converted to another kind of energy and mass (matter) can be converted to energy and energy can be converted to mass.
The total mass of the *observed* universe is something like 3 x 10^55 grams.
The universe is 10^53 kg full of mass. We have a huge universe.
It does not change because energy can never be created, nor destroyed. Energy is never lost. It always goes somewhere, or converts to a different type of energy
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The total amount of energy and mass in the universe?

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Is the total amount of energy in the universe constant?

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