AST-609intermediate

Planet Formation & Migration: Observation, Measurement & Evidence

Planetary systems form in disks around young stars, but planets do not necessarily remain where they first assembled. Migration explains compact systems, eccentric giants, resonant chains, and why Solar-System architecture is only one possible outcome.

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intermediate48 minFact checked

Planet Formation & Migration: Observation, Measurement & Evidence

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AST-608Planet Formation & Migration: Physical Mechanisms→

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AST-610Planet Formation & Migration: Advanced Connections→

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Planetary systems form in disks around young stars, but planets do not necessarily remain where they first assembled.

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A planet exchanges angular momentum with surrounding gas and launches density waves that can move it inward or outward.

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Hot Jupiters lie far inside likely giant-planet formation zones, resonant multiplanet systems preserve migration signatures, protoplanetary disks show rings and gaps, and population statistics disagree with models in which planets remain fixed at birth radii.