How many fundamental particles are in the universe?
The above cube shows the major known particle families. Each one of the matter particles has an anti-matter partner, and all of them may also have a supersymmetric ‘twin’. For example the electron’s supersymmetric twin would be called the selectron. A good place to learn more is at ParticleAdventure.org”. Copyright 1997 Dr. Sten Odenwald Return to Ask the Astronomer.
