I am using fancy words today. And the moment of inertia — the difference with a mass is that the moment of inertia is defined about some axis.You choose an axis.

我今天措辞别致，转动惯量就是——，与质量不同，转动惯量的定义跟旋转轴有关，选定一个旋转轴。

youdao

So, of course, the moment of inertia is extremely modest compared to the sun, because the radius is so small and the moment of inertia goes with the radius squared.

当然，转动惯量是,怎么也比不上太阳的，因为半径太小,而转动惯量,与半径的平方有关。

youdao

So, of course, the moment of inertia is extremely modest compared to the sun, because the radius is so small and the moment of inertia goes with the radius squared.

当然，转动惯量是,怎么也比不上太阳的，因为半径太小,而转动惯量,与半径的平方有关。

youdao