A photon emitted from a star a billion light-years away arrives at a telescope having experienced no time whatsoever. Not ...

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 feels like the most familiar thing in the world, yet it hides one of physics’ hardest questions: why do we only remember the past and never the future, and why do broken eggs not leap back into ...

A trip through time has always sparked curiosity. The idea that you could step into a machine and emerge in the past or future has captured human imagination for generations. While science fiction ...

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 ...

Introduction: time travel and the mechanics of narrative -- Macrological fictions: evolutionary utopia and time travel (1887-1905) -- Historical interval I: the first time travel story -- Relativity, ...