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For example the totalmass-energycontent of the neutral pion is converted into gammas, not just its rest mass.
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From these figures, matter accounts for 31.7% of themass-energycontent of the universe, and 84.5% of the matter is dark matter.
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The positron, which is an elementary particle, annihilates with an electron, with theirmass-energybeing released as gamma rays.
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With the advent of special relativity, these two conservation principles were united through the concept ofmass-energyequivalence.
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In order to accelerate the workingmass,energyis required.
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As the universe cooled, the restmassenergydensity of matter came to gravitationally dominate that of the photon radiation.
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