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Items tagged with "atomic clocks"

An artists's rendering of an atom with galaxies embedded inside
September 25, 2020

The Secrets Atoms Hold, Part 1: Search for Dark Matter

There’s a big unsolved mystery in physics: The cosmic balance sheet for matter in our universe just doesn’t add up. Galaxies all over space move as though they are much heavier than they appear. Scientists postulate that they are full of stuff we cannot see, stuff that they call dark matter.