define one light year find out and hom many kilometer is one light year
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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 defined as the distance travelled by light in one year.
1 light year is 9.46052841E12
the speed of light is 3x10^8 km/sec
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