Cosmic Hydrogen Halos Abound: New Survey Reveals 33,000+ Lyman-Alpha Nebulae
A large HETDEX survey uncovers more than 33,000 Lyman-alpha halos around young galaxies from 10–12 billion years ago, a tenfold increase from prior counts. This shows hydrogen halos are common during Cosmic Noon, expanding the dataset for studying early galaxy formation and gas dynamics in the early universe.