Early Galaxies Were Surrounded by Huge Clouds of Hydrogen, and...

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2026-04-17 00:00:30

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Early Galaxies Were Surrounded by Huge Clouds of Hydrogen, and Astronomers Found a Whole Bunch!

Astronomers using data from the HobbyEberly Telescope Dark Energy Experiment (HETDEX) have discovered tens of thousands of gigantic hydrogen gas halos, called Lyman-alpha nebulae, surrounding galaxies 10 billion to 12 billion years ago.

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