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3、原始星云在引力的作用下继续向中心聚集,并因星云间的潮汐作用开始(kai shi)旋转,渐渐形成一双凸透镜(tu tou jing)的形状星云收缩使引力不断增强,从而促使旋转不断加速,而旋转加速又导致星云缘不稳定,从...