Although the idea of a much more active and constantly changing solar system is an approach I find refreshing and agree with, and which has been championed by the younger generation of astronomers, I do not believe that the planet Theia ever existed. My main reason for not believing this is related to my overall hypothesis that the celestial bodies of the solar system are, in fact, the same object at different stages of the same process. In the 'Visible Earths' sub-section on Mars ( 17 - 20 ) and 'Mars Mission' sections 12 - 20, I have begun to outline the continuity between the topographies of the Earth and Mars which suggest that they share a common early impact which begins their entire tectonic cycle and also throw out their moon(s). This suggests to me that the objects which impact these bodies are not random, as the 'Theia' theory suggests.