Scale of Earth and Sun

http://www.khanacademy.org/video/scale-of-earth-and--sun?playlist=Cosmology+and+Astronomy

Speed of a bullet : 280 m/s (1000 km/hour, ~speed of jet) will take 40 hours to go around the earth
Sun 109x circumference of earth (half a year to go around the Sun)
AU - Astronomical Unit = 150,000,000 km away from the earth (take 17 years to get to the sun from the earth)