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We show that interaction with a gas disk may produce young planetary systemswith closely-spaced orbits, stabilized by mean-motion resonances betweenneighbors. On longer timescales, after the gas is gone, interaction with aremnant planetesimal disk tends to pull these configurations apart, eventuallyinducing dynamical instability. We show that this can lead to a variety ofoutcomes; some cases resemble the Solar System, while others end up withhigh-eccentricity orbits reminiscent of the observed exoplanets. A similarmechanism has been previously suggested as the cause of the lunar Late HeavyBombardment. Thus, it may be that a large-scale dynamical instability, withmore or less cataclysmic results, is an evolutionary step common to manyplanetary systems, including our own.

From mean-motion resonances to scattered planets: Producing the Solar System, eccentric exoplanets and Late Heavy Bombardments