Constant	Symbol	Value
Speed of light	c	2.9979 x 108 m/s
Planck	h	6.6261 x 10-34 J.s
Gravitational	G	6.6726 x 10-11 m3/kg/s2
Boltzmann	k	1.3807 x 10-23 J/K
Stefan-Boltzmann		5.6705 x 10-8 J/m2/s/K4
Ideal Gas		8314.5 J/kg/K
Radiation	a	7.5646 x 10-16 J/m3/K4
Wien's Law		2.8978 x 10-3 m.K
Atomic mass unit	mH	1.6605 x 10-27 kg
Proton mass	mp	1.6726 x 10-27 kg
Neutron mass	mn	1.6749 x 10-27 kg
Electron mass	me	9.1094 x 10-31 kg
Electron charge	e	1.60218 x 10-19 C
Mass of the Sun	M	1.9891 x 1030 kg
Luminosity of the Sun	L	3.8515 x 1026 J/s
Radius of the Sun	R	6.9598 x 108 m
Astronomical Unit	A. U.	1.496 x 1011 m
Parsec	pc	3.086 x 1016 m