Astronomers have successfully measured the extragalactic background light (EBL), the cumulative light from all stars and galaxies throughout cosmic history, by observing the attenuation of gamma rays from blazars. This measurement, achieved through coordinated observations from various telescopes, provides a new tool for studying the evolution of galaxies and the universe, including the epoch of galaxy formation and the reionization period after the Big Bang. Future research with advanced telescopes promises to further refine our understanding of cosmic history and the nature of exotic objects in the universe.
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