Theoretical physicist discusses time travel and the possibility of traveling to the past

The concept of traveling to the past raises questions about paradoxes and the nature of time. The idea of changing the past and potentially preventing one's own existence has been explored, but it is suggested that going to the past actually fulfills a predetermined set of events, making changes impossible. The possibility of detecting Tachyon particles, which theoretically travel faster than light, is also mentioned. Additionally, the notion of traveling before the Big Bang is discussed, highlighting the concept of there being no notion of "before" when it comes to the origin of time. The role of wormholes and parallel universes in time travel is mentioned, with the need to consider both time and space when planning a time travel journey.