Three articles published in “The Astrophysical Journal” report various aspects of a study on the epoch of reionization and bring evidence that the first galaxies transformed the universe from an opaque place to the current place where light can spread. Researchers from the EIGER team led by Simon Lilly of the ETH Zurich, Switzerland, used the James Webb Space Telescope together with some ground-based telescopes to observe primordial galaxies finding transparent regions around them thanks to the reionization of the gas.