I think he was speaking theoretically, and that if you plug in a time faster than the speed of light into Einstein's equations time starts to flow backwards.
Hello, I'm a high school senior interested in studying physics in college. I was listening to a podcast by Neil deGrasse Tyson in which he stated that if one could travel faster than the speed of light, it might be possible to travel back in time. He didn't really expand on that so I was...