https://en.wikipedia.org/wiki/Aether_(classical_element)
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According to ancient and medieval science, aether (Greek: αἰθήρ aithēr[1]), also spelled æther or ether, 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 several natural phenomena, such as the traveling of light and gravity.
Quintessence 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.
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