NeutronMass is the mass of a neutron.
PlanckConstantReduced is a universal constant, equal to PlanckConstant/(2 Pi).
PlanckMass is a universal constant.
ProtonMass is the mass of a proton.
RydbergConstant is an atomic constant appearing in the Rydberg formula expressing the wave-numbers of the lines in a spectral series.
SolarLuminosity is a physical constant.
SolarRadius is a physical constant.
VacuumPermeability is the permeability of vacuum, a universal constant.
VacuumPermittivity is the permittivity of vacuum, a universal constant.
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