"Time is an illusion" and doesn't exist as we know it, according to many physicists Time feels so obvious that we rarely question its existence. Our clocks tick, we sense the hours passing, and we connect events to a single timeline. Yet, in many corners of theoretical physics, the very notion of time as a forward-moving entity is under scrutiny. Some researchers claim that time may not exist in any fundamental way. They argue that our deeply held belief in a flowing “now” might be a trick of perception.