How big is a proton? We may finally have the answer to this puzzle

(York University) York University researchers have made a precise measurement of the size of the proton -- a crucial step towards solving a mystery that has preoccupied scientists around the world for the past decade. The world's physicists have been scrambling to resolve the proton-radius puzzle. Now, a study to be published in the journal Science finds a new measurement for the size of the proton at 0.833 femtometers, which is just under one trillionth of a millimeter.

Decade-old debate put to rest with new measurement of proton diameter

They're not big.

Fri 6 Sep 19 from ZME Science

Physics not “broken” after all? We’re close to resolving proton radius puzzle

New measurement confirms 2010 finding that proton is smaller than previously thought.

Thu 5 Sep 19 from Ars Technica

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