NASA's Webb Proves Galaxies Transformed the Early Universe
Monday, June 12, 2023 - 11:03
in Astronomy & Space
Only a few hundred million years after the big bang, the cosmos was brimming with opaque hydrogen gas that trapped light at some wavelengths from stars and galaxies. Over the first billion years, the gas became fully transparent - allowing the light to travel freely. Researchers have long sought definitive evidence to explain this flip.