Time is something we all experience, yet science is still unraveling what it truly is. One of the great mysteries in physics is why time moves only forward—a concept known as the arrow of time.
The laws of physics are largely time-symmetric—they work the same forward and backward. However, time in our everyday world always seems to flow in one direction: from past to future. Why?
The answer lies in entropy—a measure of disorder. According to the Second Law of Thermodynamics, entropy always increases in a closed system. This means the universe naturally progresses from order to chaos, and that increase gives time its direction.
Other theories explore how the expansion of the universe and quantum mechanics might shape our experience of time. Some physicists even speculate time could behave differently in other dimensions or under extreme conditions, like inside black holes.
Time remains one of the most profound puzzles in science. Understanding it may not just reshape physics—it could change our perception of reality itself.
