Unveiling the Role of Dwarf Galaxies in Reionizing the Universe

Using the James Webb Space Telescope and Hubble, scientists have made the first spectroscopic observations of some of the oldest galaxies in the universe, shedding light on the reionization period. Gravitational lensing allowed the discovery of eight extremely distant and faint galaxies within the Abell 2744 galaxy cluster, producing four times more ultraviolet light than expected and likely responsible for reionizing the universe. These findings highlight the crucial role of ultra-faint galaxies in shaping the universe's history and will aid in further investigations of the Cosmic Dawn period.