Hi everyone, I read in several documents and heard physicists say that: "The Big Bang did not happen at t=0. The Big Bang is everything that happend after t=0." What does it mean when it is stated that the Big Bang is everything that happend after t=0? Does it mean in terms of what happend after t=0: The Big Bang can be seen as the starting point of the expansion of the universe, where the universe began to rapidly expand from an incredibly hot and dense state. In this view, the Big Bang encompasses the initial event that initiated the expansion as well as the subsequent processes and events that have occurred since then, leading up to the present day. It includes the formation of matter, the development of galaxies, stars, and planets, and the ongoing expansion of space itself. So, when we refer to the Big Bang, we often use it as a broad term to describe both the initial event and the subsequent evolution of the universe, encompassing everything that has happened up until the present time. Thanks for your feedback and clarifications in advance. Kind regards Alex