Observing accreting black holes in the early Universe allows precise comparison of clocks over intercontinental distances on Earth. This is achieved with a novel observation strategy using the next generation of very long baseline interferometry systems.
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Haas, R. Clock comparison using black holes. Nat. Phys. 17, 164–165 (2021). https://doi.org/10.1038/s41567-020-01071-5
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DOI: https://doi.org/10.1038/s41567-020-01071-5
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