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...
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