Perhaps travelling back in time will become part of our reality, if has not already happened.

“It’s one of those things that we take for granted—time moves forward and never backward. But did you ever stop to wonder why it moves in one direction, as opposed to the other? The question continues to stump physicists. After all, there are certain physical processes that are actually time-reversible—they look the same no matter which way you run them.”

Full article: https://futurism.com/new-research-suggests-dark-energy-might-be-the-reason-for-times-arrow/