So here is the Earth, here is the sun, mass sun, and the orbital radius is capital r.

这是地球，这是太阳，轨道半径用r表示。

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For example, when we're talking about radial probability distributions, the most probable radius is closer into the nucleus than it is for the s orbital.

举例来说当我们讨论径向概率分布时，距离原子核最可能的半径是，比s轨道半径，更近的可以离原子核有多近。

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Radius and orbital velocities can be directly expressed as functions of time or polar angle, which is helpful for designing flight mission and motion trajectory.

这种方法可直接获得向径、轨道速度等参数随时间或极角（绕地心的转动角）的变化，便于分析轨道转移与逃逸运动，有助于飞行使命与运动轨迹的设计。

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We'll start with talking about the shape, just like we did with the s orbitals, and then move on to those radial probability distributions and compare the radial probability at different radius for p orbital versus an s orbital.

想我们对待ｓ轨道那样，我们先讨论ｐ轨道的形状，然后是径向概率密度分布,并且把ｓ轨道和ｐ轨道在,不同半径处的径向概率做一个比较。

麻省理工公开课 - 化学原理课程节选

So, the example that we took on Monday and that we ended with when we ended class, was looking at the 1 s orbital for hydrogen atom, and what we could do is we could graph the radial probability as a function of radius here.

周一我们,最后讲到了，粒子是氢原子１ｓ轨道，我们可以画出,这幅径向概率分布曲线。

麻省理工公开课 - 化学原理课程节选

For example, when we're talking about radial probability distributions, the most probable radius is closer into the nucleus than it is for the s orbital.

举例来说当我们讨论径向概率分布时,距离原子核最可能的半径是，比s轨道半径,更近的可以离原子核有多近。

麻省理工公开课 - 化学原理课程节选

The planet orbits its host star, or brown dwarf, with an orbital radius similar to that of Venus.

BBC: Tiniest extrasolar planet found