ypical of dynamical chaos (sussman & wisdom 1988， 1992). the cause of this chaotic behaviour is now partly understood as being a result of resonance overlapping (murray & holman 1999; lecar， franklin & holman 2001). however， it would require integrating over an ensemble of planetary systems including all nine planets for a period covering several 10 gyr to thoroughly understand the long-term evolution of planetary orbits， since chaotic dynamical systems are ch
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