Speed of sound in air - 741 mi/hr
Sonic, Super-Sonic, Hyper-Sonic) / Mach 1, 2, 3
Planetary Gravity – 9.8 m/s2 (6.673 * 10-11 N *m2/s2)
Standard gravity: 32.174 ft/sec
Escape Velocity = 11 km/s
Impulse Speed (Inter-Planetary) - 1 AU
Astronomical Unit - AU - Sun - Earth = 1.496 * 10^11 m
Solar System - Stellar Unit - SS - Solar System (50 AU)
Light Year - LY (3 * 10^8 m/s2)