The 'grandfather paradox' is a self-contradictory situation; traveling back in time and killing your grandfather as a child would prevent your birth.

A new study could provide the solution to the grandfather paradox that has plagued time travel theories for decades.

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.

Going back in time to make your grandfather disappear might make your own birth a touch more difficult according to the grandfather paradox. (Jokic/Getty Images) ...

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 ...