/*
 * Collection of physical constants.
 */
	/* bolzman constant in cgs */
#define KBOLTZ	1.38e-16
	/* mass of hydrogen atom in grams */
#define MHYDR 1.67e-24
	/* solar mass in grams */
#define MSOLG 1.99e33
	/* G in cgs */
#define GCGS 6.67e-8
	/* kiloparsec in centimeters */
#define KPCCM 3.085678e21
	/* Thompson cross-section (cm^2) */
#define SIGMAT 6.6524e-25
	/* Speed of Light cm/s */
#define LIGHTSPEED 2.9979e10

#define SECONDSPERYEAR   31557600.