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Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding the [energy-conservation] tag if it is specifically about its conservation.

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Where does the energy density of black holes fit in a figure with the different energy densi... [closed]

Energy Densities `The density is dependent only upon the mass of the black hole, ρ≈1.85×1019 1/m2 where now $m$ is the mass of the black hole in solar masses i.e. units where 1 means the same mass as the …
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