Why the Past Still Exists | Leonard Susskind скачать в хорошем качестве

Why the Past Still Exists | Leonard Susskind

We usually think of the past as something that no longer exists. It happened — and then it disappeared. But modern physics challenges this intuition in a profound way. In this video, we explore why the past may still exist — not as memory, but as structure. Drawing on ideas associated with Leonard Susskind, this documentary examines how relativity and modern spacetime physics reshape our understanding of time. In Einstein’s framework, there is no universal “now.” What is past for one observer may be present or future for another, depending on motion and frame of reference. This destroys the idea that the past vanishes. In the spacetime view, the universe is a four-dimensional structure. Events are not erased — they are located. The past is not something that disappeared. It is something that exists in a different region of spacetime. From this perspective, time does not flow in the way we imagine. The sense of disappearance comes from human experience, not from fundamental physics. The video also explores the role of information. Physics does not allow information to simply vanish. Even when systems evolve, the traces of past configurations remain encoded in the structure of the universe. The past may not be accessible. But that does not mean it is gone. Modern physics does not describe time as something that deletes events. It describes a spacetime where events are fixed within the structure of reality. The past has not disappeared. It is simply not where we are.