News Physics

Physicists may be a step closer to solving the mystery of proton size

For nearly a decade, the width of the puny subatomic particles has been disputed

Atom illustration

Scientists disagree over the size of protons (illustrated within the nucleus of an atom). A new measurement lends additional support to claims that protons are smaller than previously thought.

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By Emily Conover

- More than 2 years ago

If protons wore clothing, the label might read “XXS.”