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Phil O'Brien
Phil O'Brien • 2 years ago

9 Billion Years After the Big Bang Credit: Artist's conception of a young solar system: NASA/JPL-California Institute of Technology; Albert Einstein photo via United States Library of Congress The earliest stars formed when the universe was only 300 million years old. They were short-lived and supermassive, composed mostly of hydrogen and helium and containing no metals. These first stars exploded into supernovas, and successive generations were created from the remains of the earlier suns...

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