One Timeline. 13.8 Billion Years of History.Give your students a sense of "Deep Time" and historical context with this comprehensive, printable timeline. This resource bridges the gap between science and history, allowing students to see how the formation of the universe leads into the development of Earth, the rise of civilizations, and the modern world we live in today. What’s Included in the Eras:Cosmic Time: From the Big Bang (13.8 bya) through the formation of our solar system.Geologic Time