According to ancient and medieval science, Aether also spelled æther or ether and also called quintessence, is the material that fills the region of the universe above the terrestrial sphere. The concept of aether was used in several theories to explain natural phenomena, such as the traveling of light and gravity. In the late 19th century, physicists postulated that aether permeated throughout space, providing a medium through which light could travel in a vacuum, but evidence for the presence of such a medium was not found in the Michelson–Morley experiment, and this result has been interpreted as meaning that no such luminiferous aether exists.

In physical cosmology and astronomy, dark energy is an unknown form of energy hypothesized to permeate all of space, tending to accelerate the universe's expansion. Dark energy is the most accepted hypothesis to explain the observations since the 1990s, indicating that the universe is expanding at an accelerating rate.

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Assuming that the standard model of cosmology is correct, the best current measurements indicate that dark energy contributes 68% of the total energy in the present-day observable universe. The mass-energy of dark matter and ordinary (baryonic) matter add 27% and 5%, respectively, and other components, such as neutrinos and photons, contribute a minimal amount. The density of dark energy is very low, much less than the density of ordinary matter or dark matter within galaxies. However, it dominates the universe's mass energy because it is uniform across space.

To be told, the Aether helped create such elements that are common today. In the form of gates, such restraints are made to keep the natural balance as one person cannot be completely one with either the Aether, The Nether, or an element. In medieval times, they were four gates that contained elements that were the building block of not only civilization but life itself.