It doesn't simply orbit the nucleus, but as it orbits it spins.

它并不只是简单地绕原子核旋转，而是同时进行公转和自旋。

麻省理工公开课 - 固态化学导论课程节选

I am going to say if that electron is to stay in its orbit, that is to say it doesn't flee the atom, it doesn't collapse under the nucleus then the sum of the forces on the electron must be zero No net force. And so that will be the sum of a dynamic force plus an electrostatic.

如果电子会保持在它的轨道上运行,既不脱离原子的话，它就不会由于原子核对它的吸引力而被瓦解掉,电子所受的合力一定为零,由于没有合力,所以电子所受力为动态力和静电力的总和。

麻省理工公开课 - 固态化学导论课程节选

But part of the problem with the definition - I mean, as an example - is that if you look at Mars - if Mars - if we discovered a Mars-sized object out beyond the orbit of Pluto, it couldn't be a planet, because over the age of the solar system it wouldn't have time to clear its orbit.

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Geosynchronous satellites are so distant that their images aren't sharp, while low-earth orbit satellites, which fly as low as 100 miles, can feed information only when they pass over an area of interest.

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The microbes didn't use the hydrazine to launch themselves into orbit, but as an intermediate step in a larger process.

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