SI units

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The clocks that used atoms and black holes to stay in sync

11 min read
Scicomm atomic clocks caesium standard caesium-133 Event Horizon Telescope frequency comb hydrogen maser International Celestial Reference Frame Kashima Koganei Medicine microwave clocks Milky Way optical atomic clocks quasars radio telescopes SI units strontium clock uncertainty Very-Long Baseline Interferometry VLBI ytterbium clock

You're familiar with clocks. There's probably one if you look up just a little, at the upper corner of your laptop or smartphone screen, showing you what time of day it is, allowing you to qui…