This is a great beginners guide to an overview of the development of our universe according to "The Big Bang Theory." The chronology of the universe describes the history and future of the universe according to Big Bang cosmology, the Prevailing scienti c model of how the universe developed over time from the Planck epoch, using the cosmological time parameter of commoving coordinates. The model of the universe's expansion is known as the Big Bang. As of 2015, this expansion is estimated to have begun 13.799 0.021 billion years ago. It is convenient to divide the evolution of the universe into three phases. In the rst phase, the very earliest universe was so hot, or energetic, that initially no matter particles existed, or if they did, could exist only eetingly. According to prevailing scienti c theories, at this time the distinct forces we see around us today were joined in one uni ed force. In the second phase, the resulting quark-gluon plasma universe then cooled further, the current fundamental forces we know take their present forms through further symmetry breaking-notably the breaking of electroweak symmetry-and the full range of complex and composite particles we see around us today became possible, leading to a gravitationally dominated universe The third phase started after a short dark age with a universe whose fundamental particles and forces were as we know them, and witnessed the emergence of large scale stable structures, such as the earliest stars, quasars, galaxies, clusters of galaxies and superclusters, and the development of the kind of universe we see today. This book gives an overview of the above topics including graphics that show the development of our known universe."