If the distance between two objects is shortened twice, then the gravitational pull grows by a factor of 4.
如果两物体间距离缩小一半（减小到原来的1/2），则其间万有引力增大到4倍（增大3倍）。
If the distance between two objects is shortened twice, then the gravitational pull grows by a factor of 4.
如果两物体间距离缩小一半（减小到原来的1/2），则其间万有引力增大到4倍（增大3倍）。
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