Timeline of the early universe

The timeline of the early universe is a description of how our universe began and changed over time. It starts with the Big Bang, which is when our universe was created. This happened about 13.8 billion years ago. After the Big Bang, the universe expanded very quickly and created hydrogen and helium, which are the two simplest elements. Over time, these elements combined to form stars and galaxies. As time went on, stars and galaxies kept forming and growing, creating more elements. After about 9 billion years, galaxies started to have planets, and eventually life began to form. Today, we can look back in time and see the changes that have taken place in the universe since it was first created.