However, for over 200 years it has been known that there is a simple relationship giving, in AU, the semi-major axes of the actual planetary orbits. To generate this relationship, we take the series (0, 3, 6, 12, 24, ...) in which each term is the double of the previous term. If we add four to each number, and then divide by ten, we obtain the approximate distances of the planets, out to Uranus, with an extra term giving the location of the asteroid belt. Though this is known as Bode's law, it is not really a law, in the sense that there is no physical basis for it. It may just be a mathematical curiosity.

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