This document summarizes the history and current understanding of cosmology and the universe. It discusses how early thinkers like Newton and Einstein contributed to models of the universe. Key developments include Alexander Friedmann showing the universe is dynamic and expanding or contracting, Edwin Hubble discovering galaxies are moving away, and Georges Lemaître proposing the Big Bang model. Later evidence supporting the Big Bang includes the cosmic microwave background radiation and supernovae observations. Dark matter and dark energy are now understood to make up most of the universe, but their nature remains mysterious. Ongoing questions concern the composition and ultimate fate of the expanding universe.