And, for nearly 60 years, caesium atoms have said how long a second lasts. That is because caesium-133, an isotope of caesium, switches between two energy states when exposed to microwave radiation, at a rate so regular you could set your watch by it. Indeed, atomic clocks use this steady rhythm to measure time.
According to the International System of Units, a second is 9,192,631,770 cycles. It will collect samples and search for signs of ancient life The future of innovation may be research outside universities AI will make it possible to design and build organisms from scratch To enhance your experience and ensure our website runs smoothly, we use cookies and similar technologies. Registered in England and Wales.
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