The Doomsday Clock is the closest it has ever been to midnight, after it was officially reset by the Bulletin of the Atomic Scientists’ Science and Security Board (SASB) on Tuesday. The clock ...
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New atomic clock may change how we measure a second
For centuries, time was tied to Earth’s rotation, with a second defined as a fraction of a full day. But inconsistencies in the planet’s spin made that system unreliable for scientific use. Since 1967 ...
Smaller version Illustration of a conventional atomic fountain clock (left) next to NPL’s miniature atomic fountain clock. (Courtesy: NPL) A miniature version of an atomic fountain clock has been ...
Unlike other atoms (left), ytterbium-173 (right) has a large nuclear spin and a strongly deformed nucleus whose strong fields interact with the electron shell. This turns forbidden quantum jumps into ...
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