Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of ...
Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that describe gravity, quantum fields and the structure of spacetime now allow ...
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Overwriting Einstein’s theory of relativity with time travel?
The curious minds at What If examine overwriting Einstein’s theory of relativity with time travel, imagining paradoxes, ...
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