Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that describe gravity, quantum fields and the structure of spacetime now allow ...

We all thought time travel was something out of a sci-fi movie, with DeLoreans, hot tubs, Quantum Realms, wormholes, and quirky inventors. But what if it’s been with us all along? Well, believe it or ...

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of ...