EntityQ381913· pop 36· linked from 289 articlesaetherSign in to saveclassical element in philosophy and cosmology symbolising universeConnectionssulfurEntityEthiopiaCountryAlbert EinsteinPersonAristotleEntityIsaac NewtonPersonPlatoEntityLatinEntityuniverseEntitysoulEntitymercuryEntityInternational Standard Book NumberEntityJames Clerk MaxwellEntityGreek mythologyEntityvacuumEntityspecial relativityEntitywaveEntitysaltEntityChristiaan HuygensEntityalchemyEntityWayback MachineEntityCategoriesAccuracy disputes from December 2020Aether theoriesClassical elementsConcepts in ancient Greek metaphysicsEnergy (esotericism)Esoteric cosmologyHistory of scienceMythological substancesWords and phrases derived from Greek mythology