About 530 million years after the Big Bang, the universe was still being burned transparent by its first stars. Now JWST has caught EBG-1, one of the bluest galaxies ever seen at this epoch, magnified by a gravitational lens. Its extreme blue color and faint emission lines suggest it is leaking most of its ionizing light — around 85% — into space, hinting that even relatively bright galaxies may have driven reionization. We explain the finding, and why that 85% is inferred from models rather than measured directly.
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 studied EBG-1, one of the bluest galaxies known at redshift z = 9.244. Its extremely blue UV slope and weak emission lines point to an ionizing-photon escape fraction of about 85% — inferred from models, not measured directly. The finding suggests relatively UV-bright galaxies may have helped reionize the early universe.){kind=link}