Back نظريات الأثير Arabic Teories de l'èter Catalan Teorías sobre el éter Spanish نظریههای اتر Persian Teoría do éter Galician ईथर सिद्धान्त Hindi Teorie sull'etere Italian Teorie eteru Polish Teoria do éter Portuguese Teorii ale eterului Romanian
In the history of physics, aether theories (or ether theories) proposed the existence of a medium, a space-filling substance or field as a transmission medium for the propagation of electromagnetic or gravitational forces. Since the development of special relativity, theories using a substantial aether fell out of use in modern physics, and are now replaced by more abstract models. This early modern aether has little in common with the aether of classical elements from which the name was borrowed. The assorted theories embody the various conceptions of this medium and substance.