Time travel has long been a staple of science fiction, but scientists now believe that it may be possible thanks to Einstein’s theory of general relativity. According to experts, time travel isn’t about leaping from one point in the timeline to another, but rather about moving through time faster than one second per second.
The concept of time travel gained significant attention when Albert Einstein presented his theory of general relativity in 1915. The theory shows that how fast time passes in your surroundings varies with your velocity. This means that if you’re on a plane or train, you’ll be experiencing time slower than someone standing still.
In reality, astronauts on the International Space Station are already “time travelers” due to their high-speed movement around the Earth. NASA astronaut Scott Kelly has aged a little bit slower than his identical twin Mark Kelly, who stayed back on Earth, resulting in a difference of just 6 minutes and 5 milliseconds.
However, time travel to the past is much more complicated. According to Dr. Alasdair Richmond, physicist and time travel expert from the University of Edinburgh, “backward time travel is theoretically possible, but it requires bending space-time with mass.” Creating a stable wormhole or tunnel through spacetime would require negative mass, which is currently only theoretical.
While scientists can’t create a functioning time machine just yet, Einstein’s theory has opened up new possibilities for understanding the nature of time and space. As Dr. Richmond notes, “if we could build a world’s first closed timelike curve generator tomorrow afternoon, I couldn’t use it to travel to any time before tomorrow afternoon.”
Source: https://www.dailymail.co.uk/sciencetech/article-14546921/Scientists-say-time-travel-possible.html