The word αἰθήρ (aithḗr) in Homeric Greek means "pure, fresh air" or "clear sky". In Greek mythology, it was thought to be the pure essence that … See more

In Plato's Timaeus (58d) speaking about air, Plato mentions that "there is the most translucent kind which is called by the name of aether (αἰθήρ)" but otherwise he adopted the classical system of four elements. Aristotle, who had been Plato's student at the See more

With the 18th century physics developments, physical models known as "aether theories" made use of a similar concept for the explanation of the propagation of … See more

Quintessence (𝓠) is the Latinate name of the fifth element used by medieval alchemists for a medium similar or identical to that thought to make up the heavenly bodies. It was noted that there was very little presence of quintessence within the terrestrial … See more

• Akasha
• Celestial spheres
• Dark matter
• Energy (esotericism) See more