13.7 Billion Years Ago - According to scientific theories of the 20th Century, the universe was formed after what was termed the Big Bang. During the entirety of this universe's existence, scientists continually debated as to how it was formed, whether it was the only universe, and even whether or not the universe was really at least this old. Among the galaxies that were created were the Milky Way and the Andromeda galaxies. 3.5 Billion Years Ago - The first lifeforms on the planet Earth evolved from simple amino acids and proteins. 2030 - Zefram Cochrane was born on Earth.