Physicists from the University of Colorado have created an atomic clock so precise it can measure gravitational time dilation over distances as small as one millimeter. This record-breaking measurement could have implications reaching as far as redefining exactly how long a second is or discovering where all the dark matter in our universe is hiding. Up front: Einstein figured out that time functions differently depending on how close to a “gravity well” the observer is. So, for instance, if you’re standing on the Earth wearing a watch it’ll run a tad bit slower than if you’re out in space. This…
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