Sunday, 8 May 2016

special relativity - Why are objects at rest in motion through spacetime at the speed of light?



I read that an object at rest has such a stupendous amount of energy, $E=mc^2$ because it's effectively in motion through space-time at the speed of light and it's traveling through the time dimension of space-time at 1 second per second as time goes forward.


What troubles me here, is the fact that it is traveling through space-time at the speed of light. Why is it at the speed of light?




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