CONEYL JAY / SCIENCE PHOTO LIBRARY CONEYL JAY / SCIENCE PHOTO LIBRARY
Atomic clock. Conceptual artwork of the face of an atomic clock. Atomic clocks keep time by deriving a time scale from the vibrations of atoms or molecules. The element caesium is currently used in the majority of atomic clocks throughout the world. The standard second is defined as 9,192,631,770 cycles of an oscillating caesium-133 atom.
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