One light year is the distance travelled by the light in one year if the speed of the light is 300000 kilometre per second and light of the sun takes 8 minutes to reach the surface of earth find the distance of the sun from the earth.
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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.
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