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We have proposed an alternative model for the formation of our solar systemthat does not predict any mean-motion resonant interactions, planetarymigrations, or self-gravitating instabilities in the very early isothermalsolar nebula and before the protosun has formed. Within this context ofnonviolent protoplanetary evolution over more than 10 million years, we examinesome conundrums and constraints that have been discovered from studies of smallbodies in the present-day solar system (Jupiter and Neptune's Trojans and theirdifferences from Kuiper belt objects, the irregular satellites of gaseousgiants, the stability of the main asteroid belt, and the Late HeavyBombardment). These issues that have caused substantial difficulties to modelsof violent formation do not appear to be problematic for the alternative model,and the reason is the complete lack of violent events during the evolution ofprotoplanets.

Conundrums and constraints concerning the formation of our solar system -- An alternative view