This is a review article published in Nature:
http://www.nature.com/nature/journal/v468/n7320/pdf/nature09527.pdf
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.
No comments:
Post a Comment