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The 25 Biggest Turning Points in Earth's History Our planet has existed for 4.5 billion years, and it has been a busy few eons. Here are the 25 biggest milestones in Earth's history. From leaps forward in evolution to devastating asteroid impacts, these were the turning points that shaped our world. 地球史上最伟大的25个转折点 我们的星球已经存在45亿年，而有些时代曾经是很热闹的。下面是地球历史上25个最伟大的里程碑，有演化中的向前飞跃，也有行星撞击的毁灭性打击，它们是塑造我们这个世界的转折点。
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