Phys Org
•89% Informative
Each sharp plasma-etched feature seen here is smaller than 10 micrometers—a hundredth of a millimeter—across.
Highly accurate atomic clocks rely on switches between energy states of an atom's electron shell, induced by light, laser or maser energy.
The passive hydrogen maser design is the master clock aboard each Galileo satellite, keeping time to an estimated precision of one second in three million years .
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