Time travel is the stuff of fiction, of dreams. We all want to be able to either travel into the past to fix a wrong, or into the future to see what things would be. It comes as no surprise that scientists have also wondered if traveling through time is indeed possible according to our current understanding of the laws of physics.
In this video from PBS spacetime, host Matt O’Dowd, explains the various ways in which theory allows us to travel through time. The most intuitive is being able to travel at faster than the speed of light. According to Einstein, this would result in the traveler going back in time. The problem is that nothing can travel faster than light, at least nothing with mass larger than zero. So in order to travel faster we’d need to use something made out of tachyon (imaginary mass). Good luck with that.
What would you do if could travel through time?
While thinking it, checkout the video and find out all of the other ways possible; like wormholes and negative energy.
