So far as we know, no one has been able to travel through time, but scientists are still interested in the question of whether or not it would be possible in theory.
Movies like The Terminator, Donnie Darko, Back to the Future, and many others show that moving around in time breaks a lot of the basic rules of the Universe. For example, if you go back in time and stop your parents from meeting, how can you even exist to go back in time?
It’s called the “grandfather paradox,” and it’s a huge puzzle. But in September of last year, an Australian physics student named Germain Tobar from the University of Queensland said he had figured out how to “square the numbers” to make time travel possible without any paradoxes.
Tobar said in September 2020, “Classical dynamics says that if you know the state of a system at a certain time, you can figure out its whole history from that.”
“However, Einstein’s theory of general relativity predicts the existence of time loops or time travel, where an event can be both in the past and the future of itself. This theoretically turns the study of dynamics on its head.”
The math shows that space-time might be able to change so that paradoxes don’t happen.
Imagine a time traveler going back in time to stop the spread of a disease. If the mission was successful, the time traveler wouldn’t have to go back in time to stop the disease.