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 ...

Time has always seemed like the one thing physics could count on. Matter changes, stars die, particles flicker in and out, but time keeps moving. That assumption sits so deep in modern science that it ...

Physicists aren’t known for playing fast and loose with the rules of reality. But when it comes to the concept of space, some take a remarkably permissive attitude. For most of us, it would seem there ...

What does the passage of time look like for a truly quantum object? The world’s best clocks may soon be able to answer this question, testing how time can stretch and shift in the quantum realm and ...

Time seems to be one of the most obvious things in the universe: it moves forward, seconds change minutes, and the past cannot be returned. However, modern physics has long shown that everything is ...