The transitional region between planetary and galactic control, the 'inert Oort cloud', is mostly chaotic over 4.5 Gyr, with perihelion distances able to drift by tens to hundreds of au, so only a small fraction of orbits is truly inert.
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Chaos in the inert Oort cloud
The transitional region between planetary and galactic control, the 'inert Oort cloud', is mostly chaotic over 4.5 Gyr, with perihelion distances able to drift by tens to hundreds of au, so only a small fraction of orbits is truly inert.