具体来说，光度与半径的平方呈正比。
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。
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.
将该理论应用到行星这类球体的时候(在本例中，指火星)，质量给定的时候，表面重力与它半径的平方成反比。
When applied to a spherical body like a planet with a given mass (in this case, Mars), the surface gravity will be approximately inversely proportional to the square of its radius.
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