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Loading contentPlanets do not necessarily stay where they form: gravitational interaction with the gas disk, or later with other bodies, can move them inward or outward over time. Migration is the standard explanation for hot Jupiters — giant planets on scorching close-in orbits where they could not have formed — and shapes the architecture of whole systems.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.