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.
This means that the distance where the brightness of the candle is at the minimum brightness visible to a human eye is 70,000 meters, or 70 kilometers, or about 43 miles. This distance seems rather large, but keep in mind that this is a theoretical maximum distance.