Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that ...

The botched launch of two global-positioning satellites four years ago has proven to be a real gift to physicists. Scientists have used the Galileo 5 and Galileo 6 spacecraft to measure "gravitational ...

Einstein’s theories of relativity propose that forward time travel is theoretically feasible by nearing light speeds, but backward time travel presents more challenges. Theoretical models like ...

The Earth appears to be young at heart. A new study has found that our planet's core is around two and a half years younger than its surface. Researchers say this is down to a strange quirk in physics ...

Tracking time is one of those things that seems easy, until you really start to get into the details of what time actually is. We define a second as 9,192,631,770 oscillations of a cesium atom.

Standing in the elevator of a towering skyscraper, you might wonder if your journey upward changes more than just your view. The answer might surprise you: time itself actually flows differently as ...