Sure, it's fun to indulge in fantasy about having the ability to alter time. Perhaps stealing some plutonium and seeing how your parents met would be very educational. As long as you don't mind your mom accidentally hitting on you.
The theory arises from a major question that the physics world has pondered for years. At the time of the Big Bang, the universe was made of equal parts matter and antimatter. But in our universe, after the Big Bang, we only have matter.
But in a study conducted in 2004, scientists at Caltech attempted to answer the question, “Why does time only move in one direction?” To answer this, they created a model of the Big Bang in which two universes are created.
In one universe, everything is made of matter. In the other universe, everything is made of anitmatter. And in that antimatter universe, the arrow of time went the opposite direction. In other words, time ran backwards.
In 2014, three more scientists conducted a similar study and again found that time flowed in different directions from two universes created from the Big Bang. However, since the universes share the same point of origin, people from one universe would never be able to enter into the other universe. So we'd never get to experience what it's like to have time run backwards.
And, of course, saying “time running backwards” is all relative. To people in the mirror universe, they would feel time running forward. And they would think that the way we experience time would be “running backwards.”
In the meantime, it's still fun to speculate about what's happening in the mirror universe. Is everyone living the life of Benamin Button? Sadly, we'll probably never be able to know for sure.
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It's certainly a weird concept that can make your head spin when you think about it. But for some extra clarification, watch this video from D News. Unless you're in the mirror universe, in which case the video will probably watch you instead.