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Einstein Showed That Time Is Relative. But … Why Is It?
The mind-bending concept of time dilation results from a seemingly harmless assumption—that the speed of light is the same for all observers.
The clock on a hyper-speed spaceship would literally tick slower, and if you were in that ship, you would age more slowly than your friends back home. They built a device called an interferometer, which split a beam of light in half and sent the halves along two paths of equal length, bouncing off mirrors, and merging again at a detector, like this: And here’s the genius part: They didn’t have to actually measure the speed of light, they only had to see if the two beams arrived at the detector at the same time.
Or read this on Wired
