It may have all started with a moon.
So it is not very likely that random minor impacts caused one planet to almost 70 degrees more than the other while not affecting their spin rates.
Similar spin rates point to much “smoother” processes that took place over eons but dramatically affected the properties of the two gas giants.
Scientists have already hypothesized the “Great Migration” of the outer planets through the inner solar system and its cloud of early planetessimals, which was likely the cause of events such as the Late Heavy Bombardment, which is responsible for many of the craters visible on our Moon.
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