Scott Air Force Base, IL Demographic Information *. There is no Census data for the city of SCOTT AIR FORCE BASE, IL. We have pulled information for the ZIP Code 62225 instead.
A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More p recisely, one light-year is equal to 9,500,000,000,000 kilometers.
How huge? Light moves at 186,282 miles per second, or 299,792.5 kilometers per second. That's 670.6 million miles an hour. The distance to the nearest star is 4.3 light-years, or 25.3 trillion miles (40.7 trillion km). The first mention of light-years dates back to 1838 and a German scientist named Friedrich Bessel.