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The Conversation USA

After our universe's cosmic dawn, what happened to all its original hydrogen?

  • Written by Aaron Parsons, Associate Professor of Astronomy, University of California, Berkeley
imageLight from the universe's first galaxies destroyed the hydrogen atoms that formed during the Big Bang.NASA, ESA, R. Ellis (Caltech), and the UDF 2012 Team, CC BY

When our universe first blasted into existence with a Big Bang almost 14 billion years ago, it looked much different than it does today. Instead of planets, stars and galaxies, there was...

Read more: After our universe's cosmic dawn, what happened to all its original hydrogen?

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