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

One of the general theories of relativity, ' time dilation, ' is a phenomenon in which when the gravity applied to two points is different, the time at the two points travels differently. When we say ...

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 ...

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.