A new measurement bolsters the case for a (slightly) smaller proton

The PRad physics experiment studies how electrons scatter off of protons

proton illustration

EXTRA SMALL  Protons are small, but scientists disagree on exactly how small. A new finding from the PRad physics experiment suggests that the subatomic particle is extra tiny.

pixelparticle/Shutterstock

This article is only available to Science News subscribers.

Subscribers, enter your e-mail address to access our archives.

Not a subscriber?

Science News is a nonprofit.

Support us by subscribing now.

More Stories from Science News on Physics

From the Nature Index

Paid Content