The Carina Nebula: star birth in the extreme. Two telescopes, the Hubble and the Cerro Tololo Inter-American Observatory in Chile were used to make this image. Credit: NASA, ESA, N. Smith
The watches we wear on our wrists or the clocks we put on our walls are not atomic clocks. There are not all that many true atomic clocks - and they tend to be rather large and expensive. So, unless it looks something like the picture alongside from the National Institute for Standards and Technology
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