How the First Stars Transformed the Universe

After the Big Bang, the universe was too hot for atoms to form, consisting of particles. As it cooled, hydrogen and helium atoms formed, leading to the creation of the first stars. These stars, much larger and hotter than modern ones, played a crucial role in reionization, turning neutral hydrogen into ions. They also produced heavier elements through nuclear fusion, which were spread across the universe by supernovas. This process laid the foundation for the formation of modern stars, planets, and life. Understanding reionization helps scientists learn about the universe's evolution.

What were the first elements formed after the Big Bang?

How did the first stars affect the neutral hydrogen in the universe?

What role did dark matter play in the formation of the early universe?

Describe the differences between the first stars and modern stars.

What is reionization and why is it significant?