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However, in the present dark-energy era, it dominates the mass–energy of the universe because it is uniform across space.[94][95] Two proposed forms for dark energy are the cosmological constant, a constant energy density filling space homogeneously,[96] and scalar fields such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space.

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An explanation for why the expansion of the Universe is accelerating remains elusive. It is often attributed to "dark energy", an unknown form of energy that is hypothesized to permeate space.[93] On a mass–energy equivalence basis, the density of dark energy (~ 7 × 10−30 g/cm3) is much less than the density of ordinary matter or dark matter within galaxies.

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