In cosmology, the is the era roughly 50 million to 1 billion years after the Big Bang when the first light-producing objects began to illuminate the universe.
: Gravity pulled primordial gas together to form the very first celestial structures, which eventually triggered the Epoch of Reionization by ionizing the surrounding gas. Cosmic Dawn
Understanding Cosmic Dawn - NASA Scientific Visualization Studio In cosmology, the is the era roughly 50
: Scientists use tools like the James Webb Space Telescope (JWST) and low-frequency radio telescopes to peer back over 13 billion years to witness these "first lights". Cosmic Dawn