The------of gravity makes things fall to the surface of the earth.

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The------of gravity makes things fall to the surface of the earth.
The------of gravity makes things fall to the surface of the earth.

The------of gravity makes things fall to the surface of the earth.
force of gravity 地心引力
force是一种力

force

是否是地球重力所产生的向心力使得在轨物体(如人造卫星等)返回地球表面呢?