人们发现，在一些保存着太阳系原始化学成分的陨石中，铱元素的含量很高。
Ir is found in high concentrations in some meteorites, in which the solar system's original chemical composition is preserved.
我们的太阳系中的行星不是那些可以通过理论预测其组成的普通行星，而是独特的个体，它们的化学和构造特征都是由它们创造的。
Instead of normal planets whose composition could be predicted by theory, the planets populating our solar system are unique individuals whose chemical and tectonic identities were create.
我面临的一个重要挑战就是怎样找到探测、表示以及绘制太阳系复杂有机化学物质的最佳方法，来观察木卫二冰层下的海洋是否会有生命存在。
One of my key challenges is figuring out how best to detect, characterize, and map complex organic chemistry out there in the solar system to see if Europa’s ice-covered ocean is, in fact, inhabited.
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