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宇宙起源于138亿年前的一次大爆炸，宇宙黎明和宇宙再电离，是宇宙演化过程中非常重要的一个阶段，但由于它的亮度低、距离远，通过传统光学或红外望远镜很难直接观测到第一代星系。为了填补漫长的空白记忆，我们通过中性氢21厘米谱线重现宇宙。宇宙是怎么演化的？什么是21厘米谱线？观测宇宙还面临着哪些困境？“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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