As these first stars radiated light, they heated and ionized the surrounding hydrogen gas, a process that concluded roughly 1.1 billion years after the Big Bang. 🔭 Tools for Exploration
Approximately 180 million years after the Big Bang, the first stars (known as Population III stars) began to shine. Cosmic DawnHD
Before the Cosmic Dawn, the universe was filled with neutral hydrogen gas and lacked any light-emitting sources. As these first stars radiated light, they heated