地球转动45亿年的动力源是什么？

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Recorded26 Sep 2019

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地球大约在45亿年前形成，从形成那一天起，地球就开始自转和公转。直到现在，地球还在一直转动。那么，地球转动的动力源是什么呢？地球在未来会停止转动吗？地球是不是永动机呢？

“What did the council decide on item 42?” — answered with the speaker and the moment.