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  "publishedAt": "2026-04-06T17:48:43.000Z",
  "site": "https://upstract.com",
  "textContent": "Astronomers thought the early universe was full of hydrogen: Now they've found it The Eberly Telescope Dark Energy Experiment (HETDEX) has discovered tens of thousands of gigantic hydrogen gas halos, called \"Lyman-alpha nebulae,\" surrounding galaxies 10 billion to 12 billion years ago. Known as…",
  "title": "Astronomers thought the early universe was full of hydrogen: Now they've found it"
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