planetary differentiation
... planetary differential 封闭差动轮系 planetary differentiation 行星分化 planetarium projector 天象投影仪 ...
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拥有硅酸盐金属核心与冰质幔层的大量已分化小行星是最佳选择。
A large, differentiated satellite - with a core composed of silicates and iron, and a lighter mantle made of water ice - would be a good choice.
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