評論
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Orbit
軌道
Do you know what an orbit is?
你知道什么是軌道嗎？
An orbit is the path of a planet when it moves around the sun.
軌道是行星圍繞太陽運動的軌跡。
It is similar to a cycling track.
它類似于自行車賽道。
As long as a person runs on a cycling track, the person will always rotate around the center of the track.
只要人在自行車賽道上跑步，他就會一直繞著賽道的中心旋轉。
The person is like a planet and the center of the track is like the sun.
這個人就像一個行星，軌道的中心就像太陽。
So why do the planets rotate around the sun?
那么為什么行星繞著太陽旋轉呢？
It is because of the gravity of the sun and the planets.
這是因為太陽和行星之間的引力作用。
Do the orbits of the planets all look the same?
行星的軌道看起來都一樣嗎？
No, Mercury has the most elliptical orbit.
不，水星軌道是最像橢圓。
