混沌理论是由科学家提出的，试图解释行星的运动和环境条件的变化。

Chaos theory was developed by scientists, trying to explain the movement of the planets and the changes in environmental conditions.

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开普勒第二定律说到，首先每个行星的运动都保持在同一平面内。

So, what Kepler's second law says is that the motion of planets is, first of all, they move in a plane.

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抬头仰望天空中行星的运动，你将会发现它们并不是简单地绕着地球旋转。

If you look at the motion of the planets in the sky, you will find that they don't simply go around the earth in a continuous circle.

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Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?

水银是液态金属，水银，行星，是肉眼能看到的运动最快的天体,火星，铁，为什么火星是红色的？

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By putting the two together, out comes the elliptical motion of the planets.

将这两个式子联立,就得到了行星作椭圆运动的方程

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Then again, you will find the evolution of the planetary motion, because the rate of change of the rate of the change of the position is connected to the position.

同样地,这就是行星运动的演化过程,因为行星位移的变化率的变化率,与它的位移有关

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