Astrophysics (index)about


(protons, neutrons, and other three-quark particles)

A Baryon is a composite particle made of three quarks, such as a Proton or Neutron. They make up nearly all the mass of matter in the universe. Baryons, along with Mesons, which comprise two quarks are Hadrons.

Electrons and Neutrinos are Leptons which are not made of quarks, but are elementary particles in their own right. Photons are examples of particles that are neither leptons or hadrons.


Referenced by:
Astronomical Quantities
Baryon Acoustic Oscillations (BAO)
Baryon Oscillation Spectroscopic Survey (BOSS)
Critical Density (ρc)
Gas Fraction
Lambda-CDM model (ΛCDM)
Mass Density
Sloan Digital Sky Survey (SDSS)
Tully-Fisher Relation (TFR)