这是世界上首次利用地照来研究陆地和海洋对行星表面亮度的影响。 在其他研究中，已经使用色谱和红外传感技术来确认植物以及进行气候监测。

This is the first study in the world to use the reflection of the Earth to measure the effect of continents and oceans on the apparent brightness of a planet.

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一个困扰着行星科学家的问题是：海洋是怎样在像地球这样由硅酸盐和金属组成的石质行星的表面形成的？

One question that has baffled planetary scientists is how oceans formed on the surface of terrestrial planets like Earth — rocky planets made of silicate and metals.

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这颗行星也可能完全被海洋覆盖。

It could, too, be covered in oceans, perhaps completely.

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