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Planetary migration
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=== Planetesimal disk === During the late phase of planetary system formation, massive protoplanets and [[planetesimal]]s gravitationally interact in a chaotic manner causing many planetesimals to be thrown into new orbits. This results in angular-momentum exchange between the planets and the planetesimals, and leads to migration (either inward or outward). Outward migration of [[Neptune]] is believed to be responsible for the resonant capture of [[Pluto]] and other [[Plutino]]s into the 3:2 [[Orbital resonance|resonance]] with Neptune.
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