Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric ...

Physics What is time? The mysterious essence of the fourth dimension The true nature of time continues to elude us. But whether it is a fundamental part of the cosmos or an illusion made in our ...

But it is boring in comparison to the larger questions about space and time. Discussing what space and time are and where they came from is now within the realm of particle physics.

Spacetime may emerge from a more fundamental reality. Figuring out how could unlock the most urgent goal in physics—a quantum theory of gravity ...

The ability to jump forward and backwards in time has long fascinated science fiction writers and physicists alike. So is it really possible to travel into the past and the future?