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A pair of German physicists claim to have broken the speed of light - an achievement that would undermine our entire understanding of space and time.
According to Einstein's special theory of relativity, it would require an infinite amount of energy to propel an object at more than 186,000 miles per second.
For instance, an astronaut moving faster than it would theoretically arrive at a destination before leaving.
The understanding of Nimtz and Stahlhoven is that tunneling is the one and only observed violation of special relativity but according to them, that is not a violation of causality: due to the temporal extent of every signal it is impossible to transport information into the past. They claim that tunneling can be explained with virtual photons like Richard Feynman predicted.