Show 236: Solar System Shake Up

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Was the solar system always the organized clockwork system envisioned by Isaac Newton? According to a computer model of the early epoch of the solar system, the answer is "no." The large outer planets may have been closer to the Sun and migrated outwards while encountering small bodies called planetesimals. As the big planets moved outward, small objects cascaded toward the inner solar system, bombarding the four small, rocky planets. The model also predicts other oddities of the solar system that have gone unexplained.