Time dilation | Special relativity | Physics | Khan Academy
Time dilation | Special relativity | Physics | Khan Academy https://youtu.be/2BVGig1LXLs via @YouTube In physics and relativity, time dilation is the difference in the elapsed time as measured by two clocks. It is either due to a relative velocity between them ("kinetic" time dilation, from special relativity) or to a difference in gravitational potential between their locations (gravitational time dilation, from general relativity). When unspecified, "time dilation" usually refers to the effect due to velocity. https://en.wikipedia.org/wiki/Time_dilation
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