Sun radius

If M is the mass of the sun , the radius of the event horizon is three kilometers .

视界的半径就是，3公里，若M是太阳的三倍重。

If M is three times the mass of the sun , the radius of the event horizon would become ten kilometers .

视界的半径，会是10公里，质量呈直线上升。

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。