Time Travel

We just don't know. This is e realm where we are like on the cutting edge. Theoretically, people are looking at the rules of how space and time bend and twist. And so it's sort of like exploring the universe, but just inside our own heads. We can't necessarily yet go out there and build these things in space and say, let's see what happens experimentally. But we can do mlar like thought experiments, when we say, what would happen if you did this?