Background RadiationFilling all space, e.g. the radiation from the early, hot universe.
BaryonSubatomic particles comprised of three quarks. Protons (comprised of two up quarks and one down quark) and neutrons (made up of two down quarks and one up…
Baryonic MatterOrdinary matter, which is made up largely of baryons.
Big BangThe scientific theory of the origin of the universe as an explosion of space and matter, starting from an enormously dense and hot state at some finite…
Black Body SpectrumA plot of the intensity of radiation versus wavelength for a black body.