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.

An curved arrow pointing right. Most people usually write off the idea of time travel as fantasy. But in reality, it occurs all the time — in small ways — as the result of time dilation.

What if time is not as fixed as we thought? Imagine that instead of flowing in one direction—from past to future—time could ...

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed ...

Time travel is one of the most captivating tropes ... This mechanism would keep the laws of physics intact overall, even if local segments of time temporarily behave in ways that seem to break ...

Time travel has captivated our imagination for decades, but what does physics say about its possibility? Groundbreaking theories from Einstein’s relativity challenge our conventional ...

While time travel is cool science fiction tech, it seems to directly contradict our current understanding of physics. But what about, instead of moving a whole person back in ...

He noted that time travel is theoretically possible, according to the laws of physics - but only into the future, not the past. According to Einstein's theory of special relativity, time and space ...