Based on current theories of planetary evolution, any extraterrestrials observing the solar system 4 billion years ago would have seen oceans on Venus, Earth, and Mars.

基于现在星球进化的理论，四十亿年前任何外星人观察太阳系都会发现在金星，地球和火星上有海洋存在。

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These gravitational effects have a subtle, but apparently significant influence on the evolution of planetary orbits in the solar system.

这些引力作用对太阳系行星轨道的演变具有微妙而又明显重要的影响。

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Each planet in the solar system in different stages of the evolution process of the planet, with different characteristics.

太阳系各行星都处在行星演化进程的不同阶段，具有不同的特征。

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Her theory rests on a new picture of the evolution of the early solar system.

ECONOMIST: Unbuckling the Kuiper belt

But a new model that simulates the birth and evolution of planets shows that conditions need to be just, just right to get a solar system like ours.

NPR: What Makes Our Solar System Special?