Time travel to the past is basically impossible without breaking some laws of physics and acquiring plutonium from some Libyans. But time travel to the future is easy, we’re all doing it right now. So why does time go forward and not back?
The idea that time only flows in one direction is called the Arrow of Time. But odd as it sounds, there’s nothing in the equations that describes the laws of physics that says it has to be this way.
The equations can tell you what will happen in the future or what took place in the past based on what’s going on in the present, but they don’t explicitly state that time must go from past to present to future. The math works just as well going in either direction.
The one thing that seems to keep driving this is the second law of thermodynamics, which states that entropy must always increase. Things must go from order to chaos; heat must disperse from hot bodies to colder ones. It’s this increase in entropy that keeps the ordered past behind us and the increasingly messy future ahead. But there seems to be a loophole in the second law of thermodynamics, and scientists recently exploited it to turn entropy on its ear.
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