Astronomy & Space Science · AST-609
Planet Formation & Migration: Observation, Measurement & Evidence
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Evidence
Evidence for Planet Formation & Migration
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.
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References & evidence
Source library for this chapter
These are the linked sources supporting the verified claims used throughout the lesson.
- 01Exoplanet FactsOpen source ↗
NASA Science
- 02The Birth of Stars and the Discovery of Planets outside the Solar System — SummaryOpen source ↗
OpenStax Astronomy 2e
View claim-by-claim traceability3 verified claims
Planetary systems form in disks around young stars, but planets do not necessarily remain where they first assembled.
supported · checked Sep 22, 2026A planet exchanges angular momentum with surrounding gas and launches density waves that can move it inward or outward.
supported · checked Sep 22, 2026Hot 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.
supported · checked Sep 22, 2026