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银河包含着2000亿颗恒星，地球上的重金属可能来源于两颗碰撞的中子星，氮元素、钙元素、碳元素则是来自于爆炸的星星抛洒的物质。我们可观测的宇宙十分广袤，但人类的寿命却又如此短暂。地球上的生命都经历了什么？为什么要探索宇宙？“格致论道”是中国科学院全力推出、中国科普博览承办的科学讲坛，致力于精英思想的跨界传播。登录官方网站（self.org.cn）、微信公众号“SELFtalks”获取更多信息。
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