The James Webb Space Telescope continues to challenge our understanding of the early universe, revealing galaxies that are brighter, bigger, and more mature than expected. This phenomenon, known as cosmic dawn, has astronomers rethinking how quickly the first galaxies formed stars and assembled after the Big Bang. The latest discovery, MoM-z14, is the most distant spectroscopically confirmed galaxy, whose light left it about 280 million years after the Big Bang. This finding, along with others, suggests that star formation was more efficient in the early universe, where stellar feedback had less effect. The galaxies are not as massive as initially estimated, but they are still more abundant than expected. The puzzle lies in the brightness of these early galaxies, which is observed, while their mass is inferred and depends on assumptions about the stars producing the light. The James Webb Space Telescope's findings have led to a revision of astrophysics, rather than cosmology, as the evidence supports the former. The next steps in this research will involve larger spectroscopic samples and chemical analysis to determine how common these bright galaxies really were and to separate the light of young stars from the light of growing black holes.
