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.

A theoretical particle that travels faster than light, the tachyon has long intrigued physicists and fueled decades of ...

Vanderbilt University physicist Lorenzo Gavassino isn't so sure this is as big an obstacle as time-traveler pessimists have ...

Parallel universes crop up in two places in physical theories. One is in our conception of inflation, the theory of the extremely early universe. In those tumultuous times, many u ...

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.

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 ...

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 ...

It's almost impossible to wrap your head around how mind-blowing it would be to see a real-life time machine in action—talk ...

Traditional black holes, as predicted by Albert Einstein's theory of General Relativity, contain what are known as ...

Which might seem like it flies in the face of a lot of the assertions we’ve made so far, until we bring to the stage the third and final concept needed to bring this whole argument together—quantum ...

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 ...