Einstein's theory of relativity states that a clock located closer to a large body (e.g.
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In the experiment, the researchers used 100,000strontium atoms, which are first cooled and arranged in a vertical lattice. The scientists then measured the "wiggle" speed of light waves for atoms at the top of the lattice (the ticking of a clock) and compared it to the speed of light waves for atoms below; the difference is exactly the same redshift.
During the measurements, the researchers also contributedamendments to remove other factors that may have affected the ticking of their watch. They found a frequency shift of about one hundredth of a quadrillion percent at a distance of one millimeter - almost exactly what the theory predicted. The researchers then repeated the experiment several times over a period of approximately 90 hours.
In similar work, a team from the Universityof Wisconsin created multiplexed optical lattice clocks and used them to make high-precision differential clock comparisons. She also posted her work on arXiv.
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