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