The blog

Space Telescope Blog

Deep dives on space telescopes - JWST, Hubble, Chandra, and what comes next.

JWST NIRCam first deep field image of galaxy cluster SMACS 0723, illustrating reionization-era galaxies observed by NIRSpec.
Cosmology

JWST/NIRSpec Unveils 'Leaky' Galaxies as Key Drivers of Cosmic Reionization

A new JWST/NIRSpec study reveals that 'leaky' galaxies, with a high escape fraction of ionizing photons, played a crucial role in the reionization of the early universe.

3 min read