During the Era of Reionization, the universe was a very different place (IMAGE)

NASA/Goddard Space Flight Center

During the Era of Reionization, the universe was a very different place

Caption

More than 13 billion years ago, during the Era of Reionization, the universe was a very different place. The gas between galaxies was largely opaque to energetic light, making it difficult to observe young galaxies. What allowed the universe to become completely ionized, leading to the “clear” conditions detected in much of the universe today? Researchers using NASA’s James Webb Space Telescope found that galaxies are overwhelmingly responsible.

Credit

Credits: NASA, ESA, CSA, Joyce Kang (STScI)

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License

Public Domain

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