Time Dilation

The phenomenon, predicted by Albert Einstein’s Special and General Theories of Relativity, whereby, from the relative context of one observer's frame of reference, another’s time (for example, an identical clock) appear to run slower. Thus, moving clocks run more slowly compared to stationary clocks and, the closer the speed of movement approaches to the speed of light, the greater the effect. Gravitational time dilation is a related phenomenon, whereby time passes more slowly the higher the local distortion of space-time due to gravity (such as near a black hole, for example).