但是对于相互间不发生交互的双星系统,当它们旋转着接近对方时,天文学家就可以精确地测量出其公转周期的改变量。
With a noninteracting pair, astronomers can precisely measure the change in the orbital period of the stars as they spiral toward each other.
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。
It doesn't simply orbit the nucleus, but as it orbits it spins.
地球绕一个贯穿南极点和北极点的假想轴旋转,这个假想轴称为地轴。 同时也绕太阳公转。
The Earth spins on an imaginary line called an axis that runs from the north pole to the south pole, while also orbiting the sun.
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。
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