Water content and the internal evolution of terrestrial planets and icy bodies are closely linked. The distribution of water in planetary systems is controlled by the temperature structure in the protoplanetary disk and dynamics and migration of planetesimals and planetary embryos. This results in the formation of planetesimals and planetary embryos with a great variety of compositions, water contents and degrees of oxidation. The internal evolution and especially the formation time of planetesimals relative to the timescale of radiogenic heating by short-lived 26Al decay may govern the amount of hydrous silicates and leftover rock–ice mixtures available in the late stages of their evolution. In turn, water content may affect the early internal evolution of the planetesimals and in particular metal-silicate separation processes. Moreover, water content may contribute to an increase of oxygen fugacity and thus affect the concentrations of siderophile elements within the silicate reservoirs of Solar System objects. Finally, the water content strongly influences the differentiation rate of the icy moons, controls their internal evolution and governs the alteration processes occurring in their deep interiors.

中文翻译：

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水和类地行星和冰体的内部结构

含水量与类地行星和冰体的内部演化密切相关。行星系统中水的分布受原行星盘中的温度结构以及微星和行星胚胎的动力学和迁移控制。这导致形成具有多种成分、水含量和氧化程度的星子和行星胚胎。内部演化，尤其是星子的形成时间，相对于由短期 26Al 衰变产生的辐射加热的时间尺度，可能决定了它们演化后期可用的含水硅酸盐和剩余岩冰混合物的数量。反过来，含水量可能会影响星子的早期内部演化，尤其是金属硅酸盐分离过程。而且，水含量可能会导致氧逸度的增加，从而影响太阳系天体硅酸盐储层中亲铁元素的浓度。最后，含水量强烈影响冰卫星的分化速率，控制它们的内部演化并控制它们内部深处发生的变化过程。