评论
打印
Orbit
轨道
Do you know what an orbit is?
你知道什么是轨道吗？
An orbit is the path of a planet when it moves around the sun.
轨道是行星围绕太阳运动的轨迹。
It is similar to a cycling track.
它类似于自行车赛道。
As long as a person runs on a cycling track, the person will always rotate around the center of the track.
只要人在自行车赛道上跑步，他就会一直绕着赛道的中心旋转。
The person is like a planet and the center of the track is like the sun.
这个人就像一个行星，轨道的中心就像太阳。
So why do the planets rotate around the sun?
那么为什么行星绕着太阳旋转呢？
It is because of the gravity of the sun and the planets.
这是因为太阳和行星之间的引力作用。
Do the orbits of the planets all look the same?
行星的轨道看起来都一样吗？
No, Mercury has the most elliptical orbit.
不，水星轨道是最像椭圆。
