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 ...

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.

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

Time travel is possible Today ... Newton also believed the universe was pervaded by a single absolute time that could be symbolized by an imaginary clock off somewhere in space.

The entire Ultimate Universe is centered around time travel, meaning the future is always in flux. If the Maker wins in one potential future, there are countless others where he loses, and it’s ...

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 ...

A peer-reviewed study confirms the mathematical feasibility of time travel using closed time-like curves (CTCs), as posited by Einstein. Tobar compares the outcomes to the monkey’s paw—actions ...

Does the universe have an edge? Is time travel possible? What is a black hole, and in what sense are space, time and gravity a matter of "geometry"? The modern theory of spacetime introduced by ...

The project’s immense space-time coverage shows scientists how the telescopes will help them explore some of the biggest cosmic mysteries. They will be able to study how dark energy (the mysterious ...

Does the universe have an edge? Is time travel possible? What is a black hole, and in what sense are space, time and gravity a matter of "geometry"? The modern theory of spacetime introduced by ...