What's the fundamental reason why the speed of light cannot be broken? Why does the universe want to preserve the upper barrier on speed of light so much so that it readily slows down time rather than see the speed barrier broken? https://www.quora.com/Is-time-travel-possible Ethan Hein, works at New York University Updated Oct 4, 2014 The speed of light can't be broken because in a sense, it's the only speed there is. Brian Greene explained this well in The Fabric Of The Cosmos. You can interpret relativity to mean that everything always moves through spacetime at the speed of light. Some of that movement is through space, and some of it is through time. They add like the sides of a right triangle, so the sum of the squares of the two velocities is always c^2, the speed of light squared. Your and my velocity through space is very slow, so most of our motion is through time. A spaceship moving through space at half the speed of light will be moving through time only √3/2 times as fast as you and me. And a photon moves through space at the speed of light, so it has no movement through time at all -- time doesn't pass for a photon.
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