# Astronomers Found 10x More Hydrogen Halos Than Expected — Then Realized Their 20-Year-Old Model Was Wrong for Nearly Half of Them

- slug: astronomers-found-10x-more-hydrogen-halos-than-expected-then-realized-their-20-year-old-model-wa
- date: 2026-04-17
- category: Space & Aerospace

HETDEX catalogued 33,612 hydrogen halos around early galaxies. Nearly half required a two-component model the field had never systematically applied — and researchers say better instruments would likely reveal the same structure in every single one.

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