New atomic clock can measure the effects of relativity over the space of just a millimeter - Universe Today by AndyTomaswick
means gravity itself slows down time. So an object that is experiencing high gravity will thereby experience less time.
Having two separate atomic clocks that close together is physically impossible, so Dr. Jun Ye and his team devised a novel one for use specifically in this experiment. Typically these devices use the vibration of a certain type of atom to count time. The definition of a second itself is based on the vibrations of a cesium atom.
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