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News Feature: Reionizing the universe

Astronomers are looking to future missions to help address the mystery surrounding an epoch known as reionization. This Hubble Space Telescope image, the result of 841 orbits of telescope viewing time, contains ∼10,000 galaxies, extending back in time not long before before reionization, which took place about 500 million years after the Big Bang. Image courtesy of NASA, European Space Agency, H. Teplitz, and M. Rafelski (Infrared Processing and Analysis Center/California Institute of Technology), A. Koekemoer (Space Telescope Science Institute), R. Windhorst (Arizona State University), and Z. Levay (Space Telescope Science Institute).