Department of Astronomy, California Institute of Technology, MC 249-17, Pasadena, California 91125, USA.
Nature. 2010 Nov 4;468(7320):49-55. doi: 10.1038/nature09527.
Star-forming galaxies trace cosmic history. Recent observational progress with the NASA Hubble Space Telescope has led to the discovery and study of the earliest known galaxies, which correspond to a period when the Universe was only ∼800 million years old. Intense ultraviolet radiation from these early galaxies probably induced a major event in cosmic history: the reionization of intergalactic hydrogen.
恒星形成星系追踪宇宙历史。美国宇航局哈勃太空望远镜最近的观测进展导致了最早已知星系的发现和研究，这些星系对应于宇宙只有约 8 亿年历史的时期。这些早期星系的强烈紫外辐射可能引发了宇宙历史上的一个重大事件：星系间氢的再电离。
