back button
forward button
home button
glossary button

Are protons and neutrons fundamental?

 Physicists have discovered that protons and neutrons are composed of even smaller particles called quarks.

As far as we know, quarks are like points in geometry. They're not made up of anything else.

After extensively testing this theory, scientists now suspect that quarks and the electron (and a few other things we'll see in a minute) are fundamental.