就是因为地球的自传,所有有了万有引力.所有行星和恒星,都是通过自身自传才能把宇宙空间中的一些物质聚集到自身,从而才能形成一个星球.
科普：
万有引力的两个分量：（1）重力；（2）人随地球自传所需要的向心力.
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