Write a short note on light year .
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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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light light year is a unit of distance. it is the distance that light can travel in one year. night night moves at a velocity of about 300,000 kilometre each second. so so in one year it can travel about 10 trillion km.
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