Protons’ antimatter is even more lopsided than we thought
In the sloshing sea of particles within a proton, down antiquarks outnumber up antiquarks
![quarks and antiquarks inside a proton](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/02/022321_EC_proton-antimatter_feat.jpg?fit=1030%2C580&ssl=1)
Protons are messy on the inside. Made of three main quarks (illustrated with large spheres), the particles also harbor a constantly shifting collection of transient quarks and antiquarks (smaller spheres) and gluons (squiggles) that bind the quarks together.
Daniel Dominguez/CERN