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: It marks the end of the "Cosmic Dark Ages," a time when the universe was filled only with neutral hydrogen and helium gas.
: 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
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. : It marks the end of the "Cosmic
Understanding Cosmic Dawn - NASA Scientific Visualization Studio The Astronomical Phenomenon
: 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" most commonly refers to the when the first stars and galaxies formed , but it is also the title of a major NASA documentary and a sci-fi thriller film . 1. The Astronomical Phenomenon
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