evidenceexperimental
Time dilation occurs for objects moving close to the speed of light.
97% confidence
According to special relativity, a clock moving near the speed of light ticks slower compared to one at rest. This effect has been tested many times, for example with fast-moving particles called muons and atomic clocks on airplanes. These experiments show that time really does slow down for fast-moving objects, just as Einstein predicted.
Read the full exploration