New research by physicists Ben Tippett and David Tsang reveals that time travel is mathematically possible using Einstein’s General Relativity. The study introduces a theoretical time machine called TARDIS (Traversable Acausal Retrograde Domain in Space-time), which bends space-time into a loop, allowing movement backward and forward in time. Although the model is feasible in theory, scientists explain why it cannot be built yet due to the need for exotic matter. Explore the science, theories, and limitations behind real-world time travel in this fascinating physics breakdown.
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00:00Have you ever dreamed of hopping in a time machine and visiting the past or the future?
00:07For most of us, time travel is pure science fiction, the stuff of movies and TV shows.
00:16But what if I told you that, mathematically at least, it's actually possible?
00:22Recently, two physicists, Ben Tippett from the University of British Columbia and David Sang from the University of Maryland, dropped a bombshell.
00:36They developed a mathematical model that shows time travel could be real, based on none other than Einstein's theory of general relativity.
00:46They even gave their theoretical time machine a name that will make sci-fi fans cheer, TARDIS, which stands for a Traversable Causal Retrograde Domain in Space-Time.
01:01Yes, just like in Doctor Who.
01:05So how would this work?
01:07We know that massive objects like stars and black holes can bend space.
01:14Well, Tippett and Sang's model suggests that time can also be bent.
01:22Imagine space-time not as a flat sheet, but as a fabric that can be curved and warped.
01:29Their TARDIS is essentially a bubble of this curved space-time, as Tippett explains it.
01:37His model uses this curvature to bend time into a circle.
01:42A passenger inside this bubble wouldn't travel in a straight line through time, but would loop around, eventually arriving back at a point in the past.
01:55To an outside observer, this bubble would appear to be moving faster than the speed of light,
02:02effectively travelling forwards and then backwards in time along this circular path.
02:09But it's a mind-bending concept, turning our linear perception of time completely on its head.
02:17Now, before you start packing your bags for ancient Rome or the year 3000, there's a pretty big catch.
02:26While the math checks out, we can't actually build this machine.
02:31Yet, the problem is, to bend space-time in such an extreme way, we would need a special kind of material called exotic matter.
02:42So, while the dream of a real-life TARDIS is still a long way off, this research is a huge step forward.
03:07It takes time-travel out of the realm of pure fantasy and puts it into the world of theoretical possibility.
03:17It shows us that the universe is far stranger and more wonderful than we can imagine,
03:24and that the laws of physics might just allow for the impossible.
03:30What do you think?
03:31If you had a time machine, where would you go first?
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