The Arrow of Time and Why the Past Cannot Return
The Arrow of Time and Why the Past Cannot Return Human beings live inside a universe where everything moves in one direction. Childhood becomes memory. Moments become history. Stars burn their fuel and fade. Flowers bloom and decay. People are born, age, and die. Everything appears carried forward by an invisible current called time. Yet one of the deepest unsolved mysteries in physics is this: Why does time move only forward? This question may seem simple at first because everyday life makes the answer appear obvious. Everyone experiences the difference between past and future naturally. People remember yesterday but not tomorrow. A broken glass falls and shatters, but shattered fragments never spontaneously rise and reassemble themselves. The direction feels self-evident. But modern physics reveals something astonishing: most fundamental laws of nature do not clearly distinguish between past and future. At the microscopic level, many equations work almost equally well whether ti...