Time travel has long been a favorite idea in science fiction. Stories about changing the past or visiting the future have ...

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 ...

A ring in space, at least on paper, can do something a black hole cannot. It can connect distant regions without forcing anything through crushing gravity or a singularity.

Cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed from a high-energy to low-energy environment—the Big Bang. Today, scientists believe cosmic ...

Add Yahoo as a preferred source to see more of our stories on Google. A new tachyon theory argues faster-than-light particles may fit within relativity without the old paradoxes about time and ...

For over a century, scientists have thought of time as a fundamental property of the universe. But the more researchers seek ...

The question of how gravity interacts with the quantum world has long perplexed physicists, but a non-quantum theory of space ...