The Past Is Not Eternal

Okin-D has argued that the heavenly bodies are made out of a so-called fifth element, which unlike air, earth, fire, and water can be neither generated nor destroyed. Faloppinus spent most of his refutation of Aristotel arguing against this conception of the heavenly bodies. Okin-D wrote a little treatise, defending Aristotel's conception of the heavens as being made from a unique, indestructible material.