有几种假说，包括地球变暖或变冷，季节波动或洋流的变化，以及大陆位置的变化。

There are several hypotheses, including warming or cooling of Earth, changes in seasonal fluctuations or ocean currents, and changing positions of the continents.

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当然，我们现在知道，包括地球在内的行星都围绕太阳公转，而太阳系只是宇宙的一小部分。

Of course, we now know that the planets, including Earth, revolve around the Sun, and that the solar system is only a tiny part of the universe.

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这些小行星在横越其它内部行星后就会快速改变轨道，其中也包括地球。

Such asteroids would rapidly have adopted orbits that cut across those of the inner planets, including Earth.

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