Define light year . what is the relation between light year and kilometers?
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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. More p recisely, one light-year is equal to 9,500,000,000,000 kilometers.
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Light year is the distance traveled by light in one year. 1 light year = 9.461 * 10 power 12 km.
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