The grandfather paradox is just one of the thorny logical problems that arise with the concept of time travel. But one physicist says he has resolved them.

However, as much as we might like to travel through time, this concept raises paradoxes (things that don’t make sense) and philosophical questions about what it means—or whether it is possible ...

Whether it's preventing your own conception or handing the blueprints to a time machine to a younger version of yourself, generating a paradoxical sequence of events is a big no-no that cancels out ...

One of the most famous paradoxes ever, the grandfather paradox, cautions against making changes that could break the timeline if you were to ever travel back in time. But, according to one scientist, ...

Einstein’s general relativity predicts the existence of closed timelike curves—space-time loops allowing theoretical travel back to past events. In a rotating universe, space-time could warp ...