Dawn of the cosmos Seeing galaxies that appeared soon after the Big Bang — Sci_2017-07-26_19-55-06
Arizona State University astronomers Sangeeta Malhotra and James Rhoads, working with international teams in Chile and China, have discovered 23 young galaxies, seen as they were 800 million years after the Big Bang. Long ago, about 300,000 years after the beginning of the universe (the Big Bang), the universe was dark. There were no stars or galaxies, and the universe was filled with neutral hydrogen gas. In the next half billion years or so the first galaxies and stars appeared. Their energetic radiation ionized their surroundings, illuminating and transforming the universe.
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This dramatic transformation, known as re-ionization, occurred sometime in the interval between 300 mill...
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