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The study of planets as whole, integrated systems—their formation, composition, atmospheres, magnetic fields, and potential for life. It combines geology, atmospheric science, oceanography, and astronomy to understand worlds both in our solar system and beyond. It answers questions like: Why does Mars have such a thin atmosphere? What drives Jupiter's storms? Could there be an ocean under Enceladus's ice? It's the essential reconnaissance before any technology or engineering can be deployed.
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