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the second (SI unit)
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- 1Physicists unveil the most accurate atomic clock ever built▼Physicists unveil the most accurate atomic clock ever — and it could literally redefine the second
Physicists have announced the most accurate atomic clock ever created, a device so precise it could prompt a redefinition of the second itself. The breakthrough pushes timekeeping beyond the limits of the current caesium standard, opening the door to more exact navigation, fundamental physics tests and a future redefinition of the SI unit of time based on optical clocks.