Uranus obeys the Titius-Bode rule, it is Neptune which doesn't.\n\nNo hard explanation, only an analogy: in quantum mechanics, the outer orbits of electrons may approach a continuum, as they do in metal bonds. With the increasing distances in the logarithmic Titius-Bode sequence, probably the quadratic distance influence of gravity allow intermediary orbits.
why is Uranus out of place?