Time travel has long been a staple of science fiction, captivating imaginations with the possibility of moving through time ...

While time travel to the future is possible under general relativity, the idea of time traveling between different universes or timelines is not likely, according to physicists.

Time travel is, of course, ... Yet, one big question remains, and it’s one that’s often broached in movies and TV shows that dabble in alternate timelines: What about paradoxes?