Skywise Unlimited

How Big is Big?
The relative speed and direction of the movement of a body.
Mass   Velocity   Acceleration   Momentum   Radius   Density
photon in a vacuum 2.998 x 108 m/s
electron (neutral hydrogen) 2.19 x 106 m/s

38 caliber bullet (pistol) 182 m/s
car (freeway) 31.3 m/s
race car (formula 1) 98.3 m/s
M1A1 Tank 18.8 m/s
Space Shuttle (in orbit) 7.6 x 103 m/s
Freight train 35.7 m/s
aircraft carrier (JFK class) 15.43 m/s

baseball (fast ball) 44.7 m/s
tennis ball (pro serve) 62.5 m/s
basketball (free throw) 7.65 m/s

garden slug (large) 1.85 x 10-3 m/s
dog (greyhound) 17.8 m/s
cheetah 31.3 m/s
human (olympic sprinter) 10.1 m/s
race horse 13.9 m/s
elephant (African) 5.56 m/s
tyranosaurus rex 6.94 m/s

Mercury (relative to Sun) 4.79 x 104 m/s
Earth 2.98 x 104 m/s
Jupiter 1.31 x 104 m/s
Pluto 4.74 x 103 m/s

Sun (relative to galactic core) 2.2 x 105 m/s
Pleiades (open cluster) 4.0 x 104 m/s
M13 (globular cluster) 2.2 x 105 m/s