1 of 6 The Element of Ether The Element of Aether in the Greek Tradition According to ancient and medieval science, aether (Greek αἰθήρ aithēr[1]), also spelled æther or ether, is the material that fills the region of the Universe above the terrestrial sphere. Aether (also Æthere, Greek: Αἰθήρ), in Greek mythology, is one of the Protogenoi, the first-born elemental gods. He is the personification of the upper sky, space, ...