: It marks the end of the "Cosmic Dark Ages," a time when the universe was filled only with neutral hydrogen and helium gas.
"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 Cosmic Dawn
: Gravity pulled primordial gas together to form the very first celestial structures, which eventually triggered the Epoch of Reionization by ionizing the surrounding gas. : It marks the end of the "Cosmic
Understanding Cosmic Dawn - NASA Scientific Visualization Studio Cosmic Dawn
