A Nice Story:





I am going to try to convince you that:

1. The 4 giant planets formed within 15AU or 20AU of the Sun.
2. Beyond them was a massive disk that extended to ~30AU.
3. The 4 giant planets slowly spread due to leakage from this disk.
4. Jupiter and Saturn crossed the 1:2 mean motion resonance at 700Myr
   • Uranus and Neptune went unstable and scattered into the disk.
   • Producing the Trojans, Kuiper belt, and lunar Late Heavy Bombardment (LHB).
5. Uranus and Neptune evolve onto current orbits due to interactions with the disk.

And everyone lived happy ever after.

5AU

10AU

15AU

20AU

30AU