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Some asteroids show evidence of differentiation, a planetary process. Not conjecture. The earth survived a massive collision with a Mars sized object, that's what many astronomers believe. If this happened, how did the Earth retain it's orbit or was it pushed to a new orbit? Where might we find evidence of such a collision? Where a band or belt (hammered bracelet according to the Mesopotamians) of debris circles the Sun? Where asteroids that have undergone differentiation can be found?
Neither of us have the ability to produce or understand such a model. But here's another interesting tidbit if there are any members who double as experts in celestial mechanics. Pluto's inclination to the ecliptic is ~17.2 degrees. Saturn's axial tilt is ~26.8 degrees. That's very close to a 2/3rds ratio. If a moon was ejected from a planetary orbit following a 26.8 degree angle away from the ecliptic, what angle to the ecliptic would it acquire once it entered it's new orbit around the sun?
It's purely a conjecture.
Maybe if you can first construct a model of how such an ejection would be physically possible first.
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