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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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