I always figured the four were mercury, venus, earth and mars while the five were jupiter, saturn, neptune and uranus.
mostly just because I figured the asteroid belt seperated them and it made the most sense but I like your theory alot more!
English
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<The Kuiper Belt is outside of the Jovian system, it's the Asteroid Belt that separates them.>
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is it? my bad then, thought the asteroid belt was called the kuiper belt