Mars and Earth have orbits which change with time.
火星和地球的轨道随着时间而发生改变。
Now, circular orbits are special.
圆形轨道非常特殊。
So, orbits in general are ellipses.
所以，轨道总体上说是椭圆的。
它绕着一颗红矮星运行。
Their orbits bring them together with a minimum distance of about 200m.
他们轨道之间最小距离约200米。
月球绕地球轨道运行。
地球围绕太阳运行。
地球绕着太阳运行。
As a planet orbits, it pulls a star back and forth.
当一颗行星绕它的轨道运行时，它能来回牵引恒星。
Can a planet be as large as the star that it orbits?
行星会和母恒星一样大吗？
The satellite orbits the earth in its regular orbit.
卫星在它的固定轨道里绕地球飞行。
Astronomers had thought that the orbits of the planets were predictable.
天文学家早就认为，几大行星的轨道是可以预测的。
That is the reason for the search for asteroids with appropriate orbits.
这就是为何要寻找轨道合适的小行星的原因。
This classification is the analogy of our previous picture of stable orbits.
这种区分类似于前面的稳定轨道图形。
The general relationship between the closed orbits and the photodetachment cross section is given.
给出了闭合轨道和光剥离截面之间的一般关系。
Orbits that cross, but maybe don't come close.
轨道交叉，但行星间也许不会太接近。
Orbits that cross, but maybe don't come close.
轨道交叉，但行星间也许不会太接近。
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