Timeline

The Big Bang theory has the Big Bang, the formation of elements, the Radiation era, and all that good stuff before which all contribute to the formation of earth but it really starts with the formation of the sun about 5 billion years ago when the sun forms with a cloud of gas in a spiral arm in the Milky Way Galaxy. A large surface area of debris swirls around and it gives birth to planets, astroids, and the sun itself. About 400 million years later is when the earth formed and about 3.8 billion years from now is when the earth cooled and the atmosphere which lead to life on earth and thats how we came to be.

The Big Bang Theory