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atomic clock. an extremely accurate electronic clock regulated by the resonance frequency of atoms or molecules of certain substances, as cesium.
The Doomsday Clock is a symbolic clock face, representing a countdown to possible global catastrophe (e.g. nuclear war or climate change).he origin of the Clock can be traced to the international group of researchers called the Chicago Atomic Scientists who had participated in the Manhattan Project. After the atomic bombing of Hiroshima and Nagasaki, they started to publish a mimeographed newsletter and then a bulletin.