Researchers at the University of Surrey have made a surprising discovery while experimenting with reversing time. Their study suggests that physics doesn’t care which direction time moves. The equations governing motion work just as well forward as they do backward.
In theory, time could flow in reverse, and we’d never know the difference. Physics has never been great at explaining why time moves forward. Newton’s laws of motion and Schrödinger’s equation don’t enforce a direction for time.
If you took a video of a planet circling a star and played it backward, the physics would be just as valid. So why don’t we see broken vases reassembling themselves or spilled coffee jumping back into the cup? Scientists use Markovian dynamics to describe processes where each step depends on the last, like a domino effect.
Once things start moving in one direction, they tend to keep going that way. For instance, the Big Bang created an expanding universe, and thus, the universe continues expanding. But if physics doesn’t demand linear time, what does?
Exploring reverse time in physics
Scientists think it might have to do with the universe’s expansion. The Big Bang sent everything outward, and as the universe grows, matter cools, clumps together, and forms the planets and stars we see today.
This expansion is what gives time its one-way street. Some physicists argue that even this isn’t absolute. One radical theory suggests that the Big Bang may have created two parallel universes, each experiencing time in opposite directions.
In our universe, we remember the past and move toward the future. In the other, time might run the other way—but from their perspective, we’re the ones moving backward. Of course, time reversal remains a thought experiment.
The laws of physics say it’s possible. But reality suggests otherwise. Still, imagining a world where time might be different is intriguing.
A world where clocks tick backward, our coffee unspills, and Monday mornings never arrive. Maybe one day, science will figure out how to break free from linear time.
Image Credits: Photo by Agê Barros on Unsplash
Noah Nguyen is a multi-talented developer who brings a unique perspective to his craft. Initially a creative writing professor, he turned to Dev work for the ability to work remotely. He now lives in Seattle, spending time hiking and drinking craft beer with his fiancee.
