泰坦星对卡西尼号牵引力的细微变化表明，该星球内部为冰和岩石的混合物，且没有明晰的岩石分界线。
Subtle differences in Titan's pull on Cassini suggest that the materials inside the moon are a mix of ice and rock with no clearly defined rocky layers.
在地球上，氧化铁转换为金属组合时产生甲烷，在火星上这一作用可以借助水，碳氧化物及该星球内部的热量完成。
On Earth, the conversion of iron oxide into the serpentine group of minerals creates methane, and on Mars this process could proceed using water, carbon dioxide and the planet's internal heat.
由土星内部的热发光从下面所照亮，星球云系中的空地显得好像是白色的珍珠。
Lit from below by Saturn's internal thermal glow, clearings in the planet's cloud system appear as white pearls.
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