Astronomers with the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) have detected enormous hydrogen halos, called Lyman-alpha nebulae, around more than 30,000 galaxies 10 billion to 12 billion years ago, suggesting the raw material for galaxy growth was far more abundant than once thought. An enormous halo of hydrogen gas found in HETDEX data and superimposed over its location as seen in deep imaging from the NASA/ESA/CSA James Webb Space...
