Time can't go backwards from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
The concept that time can't go backwards is a fundamental principle in our understanding of the universe. According to the laws of physics, time always moves forward in a single direction. This is known as the arrow of time, which points from the past to the future. One way to understand why time can't go backwards is to consider the concept of entropy. Entropy is a measure of the disorder or randomness in a system. In a closed system, such as the universe, entropy tends to increase over time. This means that as time passes, things become more disordered and chaotic. If time were to move backwards, entropy would decrease instead of increase. This would violate the second law of thermodynamics, which states that entropy always increases over time. In other words, if time could go backwards, we would observe things becoming more ordered and structured, which is not what we see in the world around us. Another way to think about the impossibility of time going backwards is through the concept of causality. Events in the universe are linked by cause and effect relationships, where one event leads to another in a specific order. If time were to reverse, these cause and effect relationships would be disrupted, leading to logical inconsistencies and paradoxes.- The idea that time can't go backwards is a fundamental aspect of our understanding of the universe. It is supported by the laws of physics, such as the second law of thermodynamics and the principle of causality. Time always moves forward in a single direction, from the past to the future, and this is a key feature of the arrow of time.
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