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为何地球从46亿年前诞生开始，一直在自转，它的动力来源是什么？
地球，是一颗美丽的蓝色星球，也是人类的摇篮，大约诞生与46亿年前。从地球形成开始以来，一直在进行着自转与公转，那么地球为何一直在转动，它的动力究竟来自哪里？要揭开地球自转动力的来源，我们必须回到太阳系的形成之初......
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