In one year, light can travel 5.88 trillion miles (9.46 trillion km) A light year is a basic unit astronomers use to measure the vast distances in space. It travels at 186,000 miles per second (300,000 km/sec) How many miles are in a light year Just type the number of light years into the box and hit the calculate button. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year.
Multiply the speed of light by the number of seconds in a year, and you get the magic number About 9.46 trillion kilometers, or roughly 5.88 trillion miles. Because distances in space are truly gigantic, using regular units like miles becomes awkward The distance from earth to the sun, at roughly 93 million miles, is manageable using miles. A light year (ly) is the distance light travels in one earth year It is 9.4607×10 15 meters or 5.8786×10 12 miles, about 63 astronomical units or about 0.3 parsecs.
