"Nice model" . "outward migration" . "computer model" . . "Nice model" . "original Nice model" . "the Nice model" . . "Jupiter trojan" . . "migrated outward" . . . "Late Heavy Bombardment" . "migration of planets" . "outward migration of Neptune" . "computer simulations" . . "migration" . "irregular satellites" . "chaotic" . "trans-Neptunian objects" . "Jupiter migrated inward" .