Time travel has long been a topic of science fiction, filled with thrilling possibilities and mind-bending problems. The most famous of these problems is the "grandfather paradox". If someone travels ...

Whenever conditions approach what is needed for a time loop, so the conjecture goes, the universe would intervene (possibly through intense radiation or singularities) and destroy that path.

Einstein’s general relativity predicts the existence of closed timelike curves—space-time loops allowing theoretical travel back to past events. In a rotating universe, space-time could warp ...

Doctor Who showrunner Russell T Davies addresses whether season 15's time fracture phenomenon will be a regular obstacle for ...

A revolutionary timekeeping breakthrough could be on the horizon as scientists explore the thorium-229 nuclear optical clock, ...

Loop quantum gravity (LQG), co-developed by Rovelli, dismisses time as fundamental. The Wheeler-DeWitt equation describes a timeless universe shaped by causal interactions. Rovelli compares ...