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。
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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